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Health policy and systems research for rehabilitation: a call for papers

Alarcos cieza.

a Sensory Functions, Disability and Rehabilitation Unit, Department of Noncommunicable Diseases, World Health Organization, Avenue Appia 20, 1211 Geneva 27, Switzerland.

b Alliance for Health Policy and Systems Research, World Health Organization, Geneva, Switzerland.

Qhayiya Magaqa

Abdul ghaffar.

Rehabilitation is included in the universal health coverage (UHC) target of the sustainable development goals as an essential health service; access to rehabilitation is a human right. 1 Rehabilitation services are interventions required when people have limitations in their daily physical, mental and social functioning due to ageing or health conditions, including chronic diseases or disorders, injuries or trauma. 2 The ultimate objective of rehabilitation is to enable the person to achieve their optimal level of functioning in their environment. The coronavirus disease 2019 (COVID-19) pandemic is a reminder that rehabilitation may also be necessary in the acute, post-acute and long-term phases of infectious diseases. 3 , 4

Current estimates report that 2.4 billion people have health conditions that lead to limitations in functioning severe enough for them to need rehabilitation services. 5 This figure is expected to rise as people live longer, and with a higher number of chronic diseases. 2 Hence the necessity to position rehabilitation as an important global health priority. Such prioritization is relevant given that the need for rehabilitation services is largely unmet. In some low- and middle-income countries, for example, most people do not receive the rehabilitation services they require. 6

The post COVID-19 condition provides the world a glimpse of what it means to live with limitations in functioning and how fundamental functioning is to people’s well-being. Not being able to move around, think clearly or work are common limitations in functioning associated with health conditions that benefit from rehabilitation. This lesson from COVID-19 provides an opportunity for the global health community to recognize that functioning is the third health indicator alongside mortality and morbidity. 7 Governments must also recognize that rehabilitation is the health systems’ strategy that directly contributes to improved functioning, and thus to well-being. Overcoming the tendency of the health sector to primarily focus on prevention and treatment and to exclude rehabilitation and the needs of people with limitations in functioning is timely. The use and application of robust health policy and systems research will deliver the necessary evidence to equip health systems to be responsive to the needs for rehabilitation. 8

Situating rehabilitation as a central tenet of health systems rather than a vertical programme in health or other sectors enables a more holistic appreciation of the integrative nature of rehabilitation. Rehabilitation services can be delivered by specialized personnel in tertiary facilities. However, rehabilitation services should also be integrated at secondary, primary and community level as well as across other health services.

Political commitment is essential to mobilize resources for rehabilitation and to increase the demand for rehabilitation services. Health policy and systems research can generate evidence for informing policy and practice decisions. 9 In this context, such research seeks to understand and improve how societies organize themselves in achieving the collective health goal of optimizing functioning and the role that rehabilitation plays in health systems towards that end. This research also analyses how different actors interact in the policy and implementation processes to contribute to policy outcomes, 10 such as the political prioritization of rehabilitation.

Health policy and systems research can, for example, provide evidence on how countries can reorganize their health systems to deliver rehabilitation services for their populations. Such research lends itself to the emerging questions for rehabilitation in the 21st century and is fit for purpose for gathering evidence to implement the World Health Organization’s Rehabilitation 2030 initiative with its 10 areas of action. 11 This initiative marks a new strategic approach for the global rehabilitation community by emphasizing that efforts to strengthen rehabilitation should be directed towards supporting the health system as a whole and integrating rehabilitation into all levels of health care.

The Bulletin of the World Health Organization will publish a theme issue on advancing rehabilitation through health policy and systems research. We welcome papers that expand our current knowledge by presenting rehabilitation as a relevant strategy in health, including public health, that needs to be scaled up to adequately address population needs. Papers may focus on strategies and service provision models and on options for rehabilitation in health financing as a part of each country’s journey towards UHC. Successful and sustainable health systems models for integrating rehabilitation into primary care, approaches to community mobilization for increasing the demand for rehabilitation or models for increasing service delivery by strengthening the workforce are also of interest. The deadline for submission is 28 February 2022. Manuscripts should be submitted in accordance with the Bulletin’s guidelines for contributors (available at: https://www.who.int/publications/journals/bulletin/contributors/guidelines-for-contributors ) and the cover letter should mention this call for papers.

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Call for Papers: Implementation science for healthcare quality and safety

Advancing knowledge about how to improve the quality and safety of healthcare is a priority of BMJ Quality and Safety . Accordingly, we frequently publish studies that evaluate the effectiveness of quality improvement interventions. Methodologic advances in implementation science have had wide-spread positive impacts on healthcare delivery over the last 20 years. While many of these methods have been applied to improving quality and safety, others have rarely been applied or could be applied more often.

BMJ Quality and Safety would like to publish a series of papers on the topic of “Accelerating uptake of advances in implementation science to improve the quality and safety of patient care.” We therefore invite submissions of original research, viewpoint, review, and methodology papers related to this topic. We especially welcome submissions from implementation scientists who have not previously published in our journal – our Information for Authors pages is here .

This themed call will include submissions in the following categories:

  • Original Research: these will report research using implementation science methods to address problems with the quality and safety of health care. Manuscripts can be submitted under the ‘Original Research’, ‘Quality Improvement Report’ or ‘Short Report’ article type categories. They may present high quality evidence describing how implementation science principles and methods were used to implement an intervention and improve healthcare quality or safety. We are also interested in research that advances knowledge about measuring implementation outcomes such as acceptability, adoption, appropriateness, feasibility, fidelity, implementation cost, penetration, scaling interventions and sustainability as related to efforts to improve quality and safety. These may or may not be studies that also show improvements in care.
  • Viewpoints: these will be essays presenting a perspective or viewpoint on implementation science. These should add a new argument to a debate or present a new perspective, as well as appropriately drawing on the existing international literature. Viewpoints that compare and contrast implementation science to quality improvement/improvement science are especially welcome if they also suggest how to integrate the approaches or how to pick one approach over another.
  • Reviews: these will be any literature review relating to this topic that brings together quantitative or qualitative evidence and adds something that is more than the ‘sum of the parts’ of the included studies.
  • Research and Reporting Methodologies: articles that aim to advance research methodology or reporting standards related to implementation science in patient safety and quality improvement.

For specific formatting requirements, please refer to our author guidelines .

Manuscripts will be subject to our usual process of editorial and peer review. Please follow the online submission link https://mc.manuscriptcentral.com/bmjqs to submit your manuscript(s). Upon submission, please select the theme name from the dropdown menu and mention the themed call in your cover letter. BMJ Quality and Safety is a hybrid journal and authors can choose to pay an Article Processing fee for open access publication. For further information, please visit the ‘authors’ page of our website . For additional information on another themed issue on ‘Striving for equity in the quality and safety of patient care’, please click here .

– Bryony Dean Franklin and Eric Thomas , Editors-in-Chief, BMJ Quality and Safety

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Second Call for Papers: From COVID-19 to stronger people-centred and equitable health systems - Health policy and systems research from low- and middle-income countries

Health Policy and Planning launched a call for papers in 2020 on the basis of a Commentary in which we proposed a research agenda for Health Policy and Systems Research (HPSR) linked to COVID-19. The call led to a number of publications, which have ranged from studies on the effect of COVID-19 on the use of health services and on forgone care, to the role of trust in shaping perceptions of vaccination, mainstreaming gender in outbreak research, and inter-organisational coordination for better surveillance. Now, more than two years after the pandemic started, our overarching concern remains whether and how responses to the COVID-19 pandemic have created opportunities for strengthening socially just health systems. And now, as we look to the future, it is even more important to take a step back in order to take stock of what happened during the COVID years in terms of health system governance, transformation and innovation. We encourage submissions by researchers, policymakers, providers, health system managers and programme managers. Papers can focus on regional, national, sub-national and ‘district’-level impact and responses. We are particularly interested in papers that critically review the response to the pandemic at country-level in low- and middle-income countries.

Themes and topics

We are looking forward to receive manuscripts on the themes presented below. For each theme, we suggest research questions or topics.

  • Papers presenting a critical analysis of emergent responses
  • Papers describing and analysing the governance and policy- and decision-making processes underlying the response to COVID-19

Which lessons can be learned from the (spontaneous) response to the pandemic in terms of national-level or local health system-level governance arrangements? What is the link between governance arrangements and responsive pandemic control measures? Were bottom-up responses sustained and taken up in routine planning and management?

  • Papers on lessons learned regarding resilience of (local) health systems

What is the current discourse on resilience among policymakers, health system managers, etc. and how was is shaped by the pandemic? Is there a paradigm shift from ‘crisis management’ and ‘outbreak response’ to ‘resilient health systems’? Did the response to COVID-19 enable a deepening of the resilience of (local) health systems? In which conditions did this happen? Are there lessons being learned regarding resilience that apply to other urgent health challenges, like climate change?

Types of papers

As with the first part of this call, original research articles as well as review papers and critical commentaries are invited. We also explicitly welcome critical country-level analyses, and Innovation and Practice Reports. The latter are short reports presenting narratives, reflections and experiences from the perspective of health providers, managers and decision-makers operating at the national or sub-national level, which focus on innovative approaches to strengthen health systems.

Publication process

Papers will be published as they are accepted and will be grouped into a dedicated and ongoing Research Collection on this topic collated by Section Editors Prof. Bruno Marchal and Prof. Lucy Gilson as well as our Co-Editors-in-Chief, Prof. Sandra Mounier-Jack and Prof. Virginia Wiseman. Papers that receive positive reviews but are not deemed suitable for this collection will still be published within a standard journal issue in Health Policy and Planning All papers will be subject to peer review. We aim to have at least 50% of the papers having a first or last author from a low- and/or middle-income country. Full manuscripts should be submitted to Health Policy and Planning through the submission link on the journal website ( https://mc.manuscriptcentral.com/heapol ). During the submission process please note your paper is to be considered as part of this COVID-19 Research Collection. For enquiries please contact [email protected] .

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Director's Messages

Extended—call for papers: design and analytic methods to evaluate multilevel interventions to reduce health disparities.

Updated Aug. 25, 2022 to extend the call for papers until Sept. 30, 2022

The NIH has launched initiatives to end structural racism in biomedical research and eliminate health disparities . For example, several funding opportunities have already been released that focus on developing and testing multilevel interventions to address structural racism and other structural determinants as drivers of health disparities across the United States.

The ODP recently elevated the issue of health disparities from a cross-cutting theme for the Office to a new strategic priority . We introduced ADVANCE: Advancing Prevention Research for Health Equity , a new trans-NIH effort to encourage new prevention interventions and strategies that deliver existing evidence-based interventions and preventive services in populations that experience health disparities. We expect ADVANCE will lead to additional funding opportunities over the next several years.

Open Call for Submissions—Extended to Sept. 30, 2022

The ODP is also working hard to provide investigators with the opportunities and information they need to perform high-quality health equity research. I am proud to announce a call for abstracts for a supplemental issue of the journal Prevention Science , the official publication of the Society for Prevention Research, which will be sponsored by the ODP. The forthcoming issue will be entitled “Design and Analytic Methods to Evaluate Multilevel Interventions to Reduce Health Disparities.”

We invite you to review the detailed Submission & Review Process ,  Manuscript Details , and Frequently Asked Questions  below and submit a two-page manuscript precis to [email protected] . The deadline for submitting a manuscript precis has been extended to Sept. 30, 2022 .

Aims of the Supplemental Issue

Effectively addressing structural racism and other structural determinants to improve health equity requires rigorously tested and evidence-based multilevel interventions. However, studies that evaluate multilevel interventions face specific challenges, which require specialized design and analytical approaches.

Investigators could benefit from guidance on the appropriate design and analytic methods for evaluating these multilevel interventions, but such guidance is currently incomplete and scattered across a wide range of sources and across disciplines that do not often interact.

This supplemental issue will bring together current thinking and new ideas about design and analytic methods that would be appropriate for studies aimed at reducing health disparities, including strategies for balancing methodological rigor with design feasibility, acceptability, and ethical considerations. Of particular interest are design and analytic methods for parallel group- or cluster-randomized trials (GRTs), stepped-wedge GRTs, group-level regression discontinuity trials, and other methods that are appropriate for evaluation of multilevel interventions.

We anticipate the supplemental issue will be published in April 2024. 

Submission & Review Process

Please also refer to the Frequently Asked Questions at the bottom of this page for additional information, which will be updated regularly.

  • NOW Sept. 30, 2022 : Deadline for investigators to submit a two-page manuscript precis to [email protected] . The precis should outline the proposed design, analytic, and sample size methods, together with any new research you propose to evaluate those methods.
  • Nov. 1, 2022 : Guest editors invite selected authors to submit a full manuscript.
  • March 1, 2023 : Deadline for authors to submit initial manuscript drafts to the guest editors (see Manuscript Details below). Guest editors will review drafts for length, APA formatting, and reference style, as well as informally for content and fit with the theme of the supplemental issue. Authors will have time to incorporate feedback prior to formal submission to the journal for peer review.
  • May 1, 2023 : Deadline for authors to submit full manuscripts to Prevention Science for peer review through the journal’s online portal . Guest editors assign reviewers and make recommendations to the journal editor, who makes the final decision regarding disposition of the manuscript.

Manuscript Details

Manuscripts should be limited to 30 double-spaced pages and will need to:

  • Provide an example multilevel intervention that could be proposed to address structural racism or reduce health disparities.
  • Propose a design, analytic plan, and sample size estimation method to evaluate that intervention.
  • Present the methods and results of new research used to evaluate the proposed design, analytic plan, and sample size estimation method (where appropriate).
  • Discuss the strengths and weaknesses of the proposed approach relative to existing methods.

Additional material can be proposed as Supplemental Information to be published online. Instructions to authors for manuscript submissions are available on the Prevention Science website.

Guest Editors

  • David M. Murray, Ph.D. (ODP)
  • Patrick Heagerty, Ph.D. (Department of Biostatistics, University of Washington)
  • Melody S. Goodman, Ph.D. (Department of Biostatistics, New York University)

Additional Information

Send questions and manuscript precis submissions to Dr. David Murray at [email protected] .  

Frequently Asked Questions

(updated regularly)

1. What are the formatting requirements for the two-page manuscript precis?

  • Font size: At least 11 points
  • Font style: Arial, Georgia, Helvetica, or Palatino Linotype
  • Line spacing: Single spaced
  • Margins: 1 inch

2. Do references and figures count toward the two-page limit of the manuscript precis, or can I include them as a separate document?

Both references and figures count toward the two-page limit for the manuscript precis and should not be submitted as a separate document or attachment.

3. Can I submit a manuscript about a proposed study, or does the study need to be active or completed?

Manuscripts should provide an example multilevel intervention that could be proposed to address structural racism and reduce health disparities. This includes a study that has not been conducted but could be in the future.

4. Does the final manuscript submission need to present results of an active multilevel study?

Manuscripts do not need to present results from the study described in their manuscript, but they must provide the other information identified under Manuscript Details :

  • Provide an example multilevel intervention that could be proposed to address structural racism and reduce health disparities.
  • Note : We recognize that authors may propose a new method for design, analysis, or sample size. If this is the case, authors should provide results from simulation or other studies to demonstrate the validity of their proposed new methods.
  • Discuss the strengths and weaknesses of the proposed approach relative to existing methods.  

5. Are the guest editors interested in experimental designs (i.e., randomized trials) only, or can I submit non-experimental designs or natural experiments (e.g., policy changes or community interventions that are not randomized trials)?

Non-randomized designs will be considered, as long as the submission addresses all the requirements stated in the call for papers:

  • The two-page manuscript precis (due Sept. 1, 2022) should outline the proposed design, analytic, and sample size methods, together with any new, proposed research to evaluate those methods.
  • Each manuscript should provide an example multilevel intervention that could be proposed to address structural racism or other structural determinants and reduce health disparities.
  • Each manuscript should discuss the strengths and weaknesses of the proposed approach relative to existing methods.
  • Manuscripts that do not address design, analysis, and sample size issues for a multilevel intervention that could be proposed to address structural racism or other structural determinants and reduce health disparities will not be considered responsive.

6. Does the proposed multilevel intervention need to both address structural racism and reduce health disparities?

No. Proposed multilevel interventions are not required to address structural racism and reduce health disparities. The guest editors will consider manuscripts that propose multilevel interventions designed to address structural racism or reduce health disparities. It is acceptable if the intervention is designed to reduce health disparities but does not address structural factors. 

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  • Research article
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  • Published: 29 February 2024

The effectiveness, implementation, and experiences of peer support approaches for mental health: a systematic umbrella review

  • Ruth E. Cooper 1   na1 ,
  • Katherine R. K. Saunders 1   na1 ,
  • Anna Greenburgh 2 ,
  • Prisha Shah 6 ,
  • Rebecca Appleton 2 ,
  • Karen Machin 6 ,
  • Tamar Jeynes 6 ,
  • Phoebe Barnett 2 , 3 , 4 ,
  • Sophie M. Allan 2 , 5 ,
  • Jessica Griffiths 1 ,
  • Ruth Stuart 1 ,
  • Lizzie Mitchell 6 ,
  • Beverley Chipp 6 ,
  • Stephen Jeffreys 6 ,
  • Brynmor Lloyd-Evans 2 ,
  • Alan Simpson 1 , 7 &
  • Sonia Johnson 2 , 8  

BMC Medicine volume  22 , Article number:  72 ( 2024 ) Cite this article

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Peer support for mental health is recommended across international policy guidance and provision. Our systematic umbrella review summarises evidence on the effectiveness, implementation, and experiences of paid peer support approaches for mental health.

We searched MEDLINE, EMBASE, PsycINFO, The Campbell Collaboration, and The Cochrane Database of Systematic Reviews (2012–2022) for reviews of paid peer support interventions for mental health. The AMSTAR2 assessed quality. Results were synthesised narratively, with implementation reported using the CFIR (Consolidated Framework for Implementation Research). The protocol was registered with PROSPERO (registration number: CRD42022362099).

We included 35 reviews (426 primary studies, n  = 95–40,927 participants): systematic reviews with ( n  = 13) or without ( n  = 13) meta-analysis, or with qualitative synthesis ( n  = 3), scoping reviews ( n  = 6). Most reviews were low or critically low (97%) quality, one review was high quality. Effectiveness was investigated in 23 reviews. Results were mixed; there was some evidence from meta-analyses that peer support may improve depression symptoms (particularly perinatal depression), self-efficacy, and recovery. Factors promoting successful implementation, investigated in 9 reviews, included adequate training and supervision, a recovery-oriented workplace, strong leadership, and a supportive and trusting workplace culture with effective collaboration. Barriers included lack of time, resources and funding, and lack of recognised peer support worker (PSW) certification. Experiences of peer support were explored in 11 reviews, with 3 overarching themes: (i) what the PSW role can bring, including recovery and improved wellbeing for service users and PSWs; (ii) confusion over the PSW role, including role ambiguity and unclear boundaries; and (iii) organisational challenges and impact, including low pay, negative non-peer staff attitudes, and lack of support and training.

Conclusions

Peer support may be effective at improving some clinical outcomes, self-efficacy, and recovery. Certain populations, e.g. perinatal populations, may especially benefit from peer support. Potential strategies to successfully implement PSWs include co-production, clearly defined PSW roles, a receptive hierarchical structure and staff, appropriate PSW and staff training with clinical and/or peer supervision alongside safeguarding. Services could benefit from clear, coproduced, setting specific implementation guidelines for PSW. PSW roles tend to be poorly defined and associations between PSW intervention content and impacts need further investigation. Future research should reflect the priorities of providers/service users involved in peer support.

Peer Review reports

Peer support in mental health care is a recovery-orientated approach delivered by individuals who have lived experience of mental health difficulties (as service users, carers, parents or supporters). Peer support workers (PSWs) are employed to draw on these experiences to support mental health service users or carers of people with mental health conditions [ 1 , 2 ]. As such, PSWs are uniquely positioned to facilitate recovery through empathic engagement with service users and their support networks. The success of peer support is thought to be based in the sharing of lived experiences and mental health knowledge and through interpersonal connection [ 3 , 4 ]. Across diagnoses, peer support may promote recovery through the modelling of coping strategies, and by providing hope and an example of recovery to those dealing with mental health difficulties [ 5 ].

Peer support has been utilised across various populations and types of service, for example in services for early intervention in psychosis [ 6 ], for people with co-occurring substance abuse and mental health difficulties [ 7 ], and in community interventions to reduce mental health inpatient admissions [ 8 ]. The format of peer support varies across services, for example it may involve one-to-one or group sessions, online or face-to-face delivery, unstructured open-ended conversations or more structured manualised support, or activities such as walking groups [ 9 , 10 ]. Peer support may be delivered by trained peer support staff or on a more ad hoc basis among peers [ 11 ]. Peer support for mental health takes place within mental health services in both statutory and voluntary sector settings [ 11 ]. Although PSWs may be paid or unpaid [ 6 , 12 ], paid roles have become increasingly available in mental health care settings [ 13 ]. Professionalising PSW roles as paid demonstrates the value of the role and appropriately rewards work done, should ensure formal training, supervision and management, and may help to clarify the boundaries of the role [ 14 ].

Service user networks and researchers in relevant fields have strongly advocated for provision of peer support [ 14 , 15 ], and peer support is now recognised and recommended across international mental health policy guidance, reflecting an increased understanding of the value of embedding lived experience support in formal mental health services [ 16 , 17 , 18 , 19 , 20 ]. In the UK, peer support is currently being expanded in the NHS [ 16 ].

There have been many reviews of the peer support literature separately evaluating the efficacy, implementation, and experiences of peer support from a variety of different perspectives (e.g. [ 21 , 22 , 23 , 24 ]). Given the numerous and sometimes inconclusive results from existing reviews on this topic, our research group, the NIHR Mental Health Policy Research Unit, agreed with policy makers in England to conduct an umbrella review of peer support to provide clinicians, policy makers and researchers with an overall assessment on the evidence available, comparing results between reviews, while taking the quality of these reviews into account [ 25 , 26 ]. The aim of this systematic umbrella review is to collate, synthesise and summarise the available evidence from published reviews to address the following research questions:

What is the effectiveness (e.g. clinical, social, functional) and cost-effectiveness of paid peer support approaches for mental health?

What influences the implementation of peer support approaches for mental health?

What are the experiences of peer support approaches for mental health (e.g. of acceptability) from the perspective of PSWs, healthcare practitioners, service users, carers?

This umbrella review was conducted by the NIHR Mental Health Policy Research Unit (MHPRU), based at King’s College London and University College London, which delivers evidence to inform government and NHS policy in England, agreeing a programme of rapid research with policymakers.

Study design and protocol

We conducted a systematic umbrella review following guidance from Fusar-Poli et al. [ 27 ] and Cochrane [ 28 ]. The review is reported according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) (see Additional file 1 : Appendix 1 for the PRISMA checklist) [ 29 ]. The protocol was registered with PROSPERO (registration number: CRD42022362099) [ 30 ]. One amendment was made to the protocol after registration. We amended the ‘intervention’ section to state that reviews were excluded if the majority of interventions did not meet eligibility criteria, e.g. because we found that reviews often included paid and unpaid peer support interventions and did not report results separately.

Lived experience researcher involvement

Members of the MHPRU Lived Experience Working Group (LEWG), who collectively have substantial experience of delivering or receiving peer support, contributed extensively to this review, including protocol development, study selection, data extraction, quality appraisal, data synthesis, drafting the manuscript and lived experience commentary, and attending working group meetings.

Eligibility criteria

The eligibility criteria are detailed in full in the protocol [ 30 ]. In summary, we included:

Study designs : Published, peer-reviewed systematic, scoping or realist reviews which synthesised quantitative or qualitative data (narratively or formally using, e.g. a meta-analysis or meta-synthesis) that examined outcomes or experiences relevant to our research questions.

Intervention : We defined peer support as ‘involving a person who has lived experience of mental health condition(s), or caring for those with mental health conditions, being employed to use and draw on their experiences and empathy to support service users who have mental health conditions or carers or parents of people with mental health conditions.’ Eligible peer support approaches were paid, meaning that the PSW was paid for their work, and delivered face-to-face or remotely, for people with mental health conditions or for carers of people with mental health conditions, across any mental healthcare settings. Peer support approaches were ineligible if the PSWs were not in a dedicated peer support role, if they were primarily for physical health, or automated (i.e. peer support ‘bots’ or avatars). We excluded reviews where over 50% of primary studies in the review did not meet eligibility criteria, e.g. if the majority of people delivering the interventions were unpaid.

Population : Children, young people and adults with a mental health condition (including substance use disorders), carers, paid PSWs and mental healthcare practitioners working alongside PSWs. We excluded service users with a primary diagnosis of an organic mental disorder (e.g. dementia), neurodevelopmental disorders, acquired cognitive impairment and adjustment disorders.

Outcome measures : Included reviews reported outcomes or data on at least one of the following peer support related outcomes that addressed our research questions: (i) clinical outcomes, (ii) economic or cost-effectiveness, (iii) recovery outcomes, e.g. hope, empowerment, goal-attainment, quality of life, (iv) social outcomes, (v) implementation outcomes and barriers and facilitators to implementation, (vi) experiences of delivering, receiving or working alongside peer support and (vii) theories of what works for whom in peer support.

Information sources and search strategy

We combined terms for peer support, reviews and mental health conditions using Boolean operators (AND, OR). We searched the following databases: MEDLINE, EMBASE, PsycINFO, The Campbell Collaboration and The Cochrane Database of Systematic Reviews (see Additional file 1 : Appendix 2 for full search strategy). Searches were run from January 2012 to November 2022 as these reviews will include primary research published before 2012 [ 31 ]. There was no time limit for the primary papers in the included reviews. We had no language restrictions.

Selection process

Reviewers (KS, RC, JG, RS, RA, KM, PS, SA) screened titles and abstracts, and subsequently full texts. To ensure consistent application of eligibility criteria all reviewers initially independently screened the same ten titles and abstracts and discussed inclusion/exclusion. The remaining titles and abstracts were then screened. Records were double screened blind by two reviewers at both the title and abstract (94% agreement) and full text (86% agreement) stages. All disagreements were resolved through discussion with the study team.

Data extraction

Data extraction was completed in Microsoft Excel by the review team (RC, KS, KM, PS, JG, RS, PB, RA). The data used in the paper were checked by another member of the review team. The extracted data included basic information about reviews (e.g. number of included studies, number of participants, review type, aim/objectives), basic information about primary studies (e.g. references, designs), search strategy (e.g. databases searched, eligibility criteria), population (e.g. gender, age), peer support approach (e.g. peer support type and description), type of comparator, additional information (e.g. quality appraisal methods, review author conclusions), primary and secondary outcomes of systematic review or qualitative results.

Quality appraisal of included reviews

The quality of included reviews was independently assessed by reviewers (RC, KS, KM, PS, JG, RS, PB, RA) using the AMSTAR 2 (A MeaSurement Tool to Assess systematic Reviews), a 16-point tool for assessment of the methodological quality of systematic reviews [ 32 ]. We adapted the AMSTAR 2 to apply for scoping reviews and systematic reviews of qualitative data (described in full in Additional file 1 : Appendix 3). The following questions were adapted: (1) PICO criteria, (2) Protocol requirements, (8) Detail of included studies, (9) Risk of Bias requirement. Two reviewers (KS, AG) 100% double-scored reviews blind with any outstanding disagreements resolved through discussion between AG, KS, and RC. Overall ratings for each study were calculated according to guidance [ 32 ], based on 7 critical domains and 6 non-critical domains within the AMSTAR 2 tool. Studies with no or one non-critical weakness and no critical flaws were rated as high quality. Studies with more than one non-critical weakness and no critical weaknesses were rated as moderate quality. Studies with one critical flaw irrespective of non-critical weaknesses were rated as low quality, and those with more than one critical flaw irrespective of non-critical weaknesses were rated as critically low quality. The AMSTAR 2 guidance [ 32 ] states that reviews of critically low quality should not be relied on for comprehensive and accurate summaries of the literature.

Synthesis methods

Rq 1: what is the effectiveness (e.g. clinical, social, functional) and cost-effectiveness of paid peer support approaches for mental health.

Data were tabulated and summarised narratively by two researchers (KS, AG); effectiveness meta-analysis data calculated from two or more studies were tabulated separately from non-meta-analysis effectiveness outcomes. Review outcomes were similar, but not similar enough to combine meaningfully in a meta-analysis. Effect sizes (with 95% CIs and p -values) were reported along with I 2 statistic (with 95% CIs, p -values, χ 2 , and degrees of freedom) where available. We did not tabulate data for subgroup analyses.

RQ 2: What influences the implementation of peer support approaches for mental health?

Outcomes were tabulated according to the main domains in the Consolidated Framework for Implementation Research (CFIR) [ 33 ]. The CFIR provides a comprehensive framework, composed of 5 domains, associated with the effective implementation of interventions [ 33 ]. The 5 domains are as follows: Innovation (the ‘thing’ being implemented); Outer setting (the setting in which the inner setting exists, e.g. hospital system); Inner setting (the setting in which the innovation is implemented, e.g. hospital); Individuals (the roles and characteristics of individuals); Implementation process (the activities and strategies used to implement the innovation) [ 33 ]. Synthesis was conducted using a collaborative process involving one member of the study team (RA) and one lived experience researcher (PS).

RQ 3: What are the experiences of peer support approaches for mental health (e.g. of acceptability) from the perspective of PSWs, healthcare practitioners, service users and carers?

Experiences were synthesised narratively, by three researchers, including two lived experience researchers (TJ, KM, RC) [ 34 ]. Themes from reviews which were identified as addressing research question 3 were extracted and similar themes across the reviews were grouped together. Each group was accounted for using an existing theme from one or more of the reviews or if this was not possible a new theme was developed. Three overarching themes were identified through iterative scrutiny of the data and discussion between TJ, KM, and RC. A summary of the common themes across the reviews, grouped under the three overarching themes, was then developed, including highlighting contrasting findings.

Study selection

The search strategy identified 777 references to be screened (a further 2 papers were identified through other methods); 93 full text articles were assessed for eligibility with 57 excluded (see Additional file 1 : Appendix 4 for reasons for exclusion). Thirty-five reviews (reported in 36 papers) were included (see Fig.  1 ).

figure 1

PRISMA flow diagram [ 29 ]

Characteristics of included reviews

Review characteristics are detailed in Table  1 . Of the 35 included reviews, 13 were systematic reviews with meta-analyses, 13 were systematic reviews without meta-analyses, 3 were systematic reviews with a qualitative synthesis and 6 were scoping reviews. The individual reviews included between 95 and 40,927 participants; 6 reviews did not report the number of participants. For reviews where the population were service users, almost all were categorised as adults with mental health problems. Thirteen reviews specified that participants had severe mental illness (SMI) diagnoses [ 1 , 21 , 22 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ], six reviews explicitly included studies with participants accessing mental health services [ 22 , 37 , 38 , 43 , 45 ] [ 46 ], three reviews were conducted in perinatal populations [ 47 , 48 , 49 ], three reviews included participants with any/common mental health conditions [ 50 , 51 , 52 ], four reviews included participants with substance use disorders [ 1 , 38 , 53 , 54 ], two reviews included participants with eating disorders [ 55 , 56 ], one included people experiencing suicidality [ 57 ] and one included articles on peer support for crisis management [ 58 ]. The samples in the remaining reviews were PSWs and various stakeholders (e.g. non-peer staff, service users) [ 23 , 24 , 34 , 59 , 60 , 61 , 62 , 63 , 64 ]. Most reviews included interventions involving any form of peer support, individual, group or combined, although three reviews looked at group peer support alone [ 35 , 43 , 49 ], and three reviews looked at individual peer support alone [ 1 , 40 , 45 ]. Reviews looked at peer support delivered in-person, online or over the phone, and surveyed a range of approaches including both structured and unstructured peer support (see Table  1 ). The reviews included 426 primary studies. We assessed study overlap; most primary studies ( n  = 300) were only included in one review; however, many primary studies were included twice ( n  = 72), three times ( n  = 18) to a maximum of nine times ( n  = 1) (see Additional file 1 : Appendix 5 for overlapping studies). Only 1 review reported that people with lived experience were involved in the review [ 57 ]. Only 2 reviews assessed certainty of evidence (using GRADE) [ 21 , 22 ].

Most reviews were appraised as low or critically low (97%) quality and one review was appraised as high quality. The most common weaknesses were in critical domains concerning registering protocols before commencement of the review (21 studies), justification of excluding individual studies (28 studies) and considering risk of bias when interpreting results (13 studies). Reviews without meta-analyses were not scored in the critical domains assessing meta-analytical method or publication bias. There were 13 studies with meta-analyses assessed in these two domains: two of these exhibited one critical weakness and two exhibited two critical weaknesses. As scoping reviews are intended to provide overviews of existing literature regardless of risk of bias [ 65 ], scoping reviews were not scored in the critical domain concerning risk of bias assessment techniques (see Additional file 1 : Appendix 3 for adjustments to quality appraisal for scoping and qualitative reviews). Of the 29 reviews that were eligible to be scored in this domain, 10 exhibited a critical weakness. The review eliciting high confidence was a Cochrane review [ 21 ]. No reviews were rated as moderate. AMSTAR 2 ratings are detailed in Table  1 and in full in Additional file 1 : Appendix 3.

Results of synthesis

Rq1: what is the effectiveness (e.g. clinical, social, functional) and cost-effectiveness of paid peer support approaches for mental health.

Effectiveness outcomes were reported in 23 reviews (66% of total). A wide variety of clinical, recovery and psychosocial effectiveness outcomes were reported across both meta-analysis [ 21 , 22 , 37 , 40 , 41 , 42 , 43 , 44 , 45 , 47 , 48 , 51 , 52 ] and narrative results [ 1 , 21 , 22 , 35 , 36 , 37 , 38 , 40 , 41 , 42 , 43 , 44 , 48 , 50 , 51 , 53 , 54 , 56 , 57 , 58 , 60 ]. Comparator groups also varied across the primary studies included in the reviews, including Treatment as Usual (TaU), active controls (e.g. a comparable standard treatment) and waitlist control groups.

All outcomes except for one (family or carer use of formal community support services; [ 44 ]) were service user outcomes, rather than carer, staff or PSW outcomes. Outcomes from systematic reviews with meta-analysis are reported in Tables  2 , 3 and 4 . Effectiveness results from reviews not including meta-analysis are summarised at the end of this section and reported in full in Additional file 1 : Appendix 6. Evidence was heterogenous across all outcomes and reviews, with many analyses reporting no effect. In the meta-analysis results, there was often notable heterogeneity. There was limited data on cost and cost-effectiveness, but the evidence available from three systematic reviews without meta-analyses (See Additional file 1 : Appendix 6) suggested that peer support interventions were low cost and cost-saving [ 38 , 48 , 50 ].

Results from meta-analyses

Clinical outcomes.

For depression outcomes, evidence from two reviews with meta-analyses suggested that peer support is effective in improving perinatal depression [ 47 , 48 ]. Three reviews of peer support for adults and adolescents with mental health problems including those with SMI diagnoses reported no effect on depression post-intervention [ 22 , 35 , 43 ], where two of these reviews looked at group-based peer support alone [ 35 , 43 ]. Two of these reviews reported follow-up results; one review of group peer support for adults with any mental health condition continued to find no effect at 3–6 months follow-up [ 35 ], while the other involving adults with SMI reported improvements in depression and anxiety at 6 months follow-up, despite reporting no effect at post-intervention [ 22 ]. One review [ 52 ] measured clinical recovery in adults with any mental health diagnosis, reporting improvements post-intervention and at 6–9-month follow-up, but no improvement at 12–18-month follow-up.

Most evidence regarding mental health symptom severity among adults and adolescents with mental health diagnoses or who were using mental health services suggested no effect [ 22 , 35 , 41 , 42 , 43 , 44 ], other than for perinatal depression as previously summarised. One review [ 40 ] of individual peer support for adults with primarily SMI diagnoses reported improvements in symptom severity, while another involving adults with SMI [ 44 ] reported symptom improvements following family-led peer support, but no improvement following individual-led peer support. Results for service use varied depending on the measure, for example, peer support was associated with reduced risk of hospitalisation [ 44 ], including after a follow-up period [ 45 ], but no effect was found regarding length of stay [ 41 , 42 ].

All reviews providing meta-analytic evidence relevant to this question were rated low or critically low quality, except from one high-quality review [ 21 ] which found no effect of peer support on patient activation between 1 and 6 months follow-up (a person’s perceived ability to manage their illness and their approach to healthcare) in adults with schizophrenia diagnoses or similar SMI.

Recovery outcomes

Of the seven reviews with meta-analyses reporting data on overall self-reported recovery, five reported improvements in recovery in adults with mental health diagnoses including SMI [ 22 , 35 , 40 , 44 , 45 ]. Two studies found effects for individual peer support interventions alone [ 40 , 45 ], and one reported an effect for group-based peer support alone [ 35 ]. Only two reviews reported no effect [ 21 , 43 ], where one included studies of adults with SMI in both individual and group-based peer support [ 21 ], and the other involved studies with adults and adolescents with any mental health problem in group-based peer support alone [ 43 ].

Three reviews reported follow-up data showing continued improvements for adults with mental health diagnoses including SMI at follow-ups of 6 months [ 22 ], 3–6 months [ 35 ] and 12–18 months [ 45 ], the former and the latter reviewing individual and group peer support, and the second focussing on group peer support alone. One further review reported no improvements at medium-term follow-up (1–6 months) [ 21 ]. One review of adults with any mental health diagnosis identified improvements in personal recovery post-intervention, but not at 6–9 or 12–18 months follow-up, and found no improvements in functional recovery post-intervention or at 12–18 months follow-up, but did report improvements at 6–9 months follow-up [ 52 ].

All reviews providing meta-analytic evidence for these outcomes were rated as critically low or low quality, except for one [ 21 ] which was rated high quality. Based on evidence from three studies, this latter review [ 21 ] found no effect of peer support on recovery in the medium term for adults with schizophrenia diagnoses or similar SMI.

Psychosocial outcomes

Evidence regarding hope or hopefulness was mixed. Four reviews with meta-analyses suggested that peer support resulted in improvements in adults with SMI [ 22 , 37 , 40 , 44 ], where one of these studies looked at individual peer support alone [ 40 ] and the rest included both individual and group peer support. However, three reviews of studies including SMI and mixed mental health diagnoses samples reported no effect [ 21 , 35 , 43 ], where two of these reviews focussed on group-based peer support alone [ 35 , 43 ]. One study [ 22 ] followed up adults with SMI and those using secondary MH services at 3–6 months and found continued improvements in hope. However, another review investigating longer-term outcomes (over 6 months) in adults with SMI found no effect [ 21 ].

Improvements in empowerment were evidenced by two reviews with meta-analyses [ 40 , 51 ] of studies involving adults with any mental health diagnosis including SMI. No effects were reported in four reviews [ 22 , 35 , 43 , 44 ]. One of the meta-analyses finding positive effects of peer support on empowerment looked at individual peer support alone [ 40 ], whereas two of the meta-analyses with no effect solely involved group-based peer support [ 35 , 43 ]. Three studies reported follow-up data. Two showed improvements at 6 months in adults with SMI [ 22 ] and at 6–12 months follow-up among adults using mental health services with any diagnoses [ 45 ]. The other showed no improvements from group-based peer support only in adults with mental health diagnoses including SMI between 3 weeks and 6 months follow-up [ 35 ].

Quality of life reportedly improved in two reviews with meta-analyses [ 37 , 44 ] of studies involving adults with SMI, while there was no evidence of improvement in one other with an SMI sample [ 22 ]. The two studies which reported follow-up data continued to find no effect [ 22 , 45 ].

There were improvements in self-efficacy in adults with any mental health problem in all three reviews with meta-analyses reporting this outcome [ 43 , 44 , 51 ]. Decreases in self-stigma and stigma-related stress in adults and adolescents with any mental health problem were found by one review with meta-analysis of group-based peer support [ 43 ]. There was no evidence for peer support improving satisfaction with care [ 22 , 41 , 42 , 44 , 45 ] or relational outcomes (including social support and network) and building relationships (both personally and with staff) [ 41 , 42 , 44 , 45 ].

All reviews providing meta-analytic evidence for these outcomes were rated as critically low or low quality, except one high-quality review [ 21 ] which found no effect of peer support on hope in adults with schizophrenia diagnoses or similar SMI in the medium or long term.

Summary of results from systematic reviews without meta-analysis

Effectiveness results from systematic reviews without meta-analyses are tabulated in full in Additional file 1 : Appendix 6. These reviews presented mixed results pertaining to clinical outcomes including depression, anxiety, eating disorder pathology, and psychosis. However, two scoping reviews reported evidence of peer support in improving suicidal ideation [ 57 , 58 ]. Evidence was deemed inconclusive regarding the impact of peer support on indicators of service use, where three reviews failed to find evidence for peer support [ 21 , 22 , 41 , 42 ], three reported mixed results [ 1 , 38 , 54 ], and one found evidence for improvements associated with peer support [ 36 ]. More consistent evidence was found indicating peer support improves recovery outcomes [ 1 , 36 , 38 , 40 , 44 , 53 ]. For most psychosocial outcomes, systematic reviews presented mixed evidence, for example different effects were found by one high-quality review for empowerment, hope and self-efficacy, depending on what measures were used [ 21 ]. Despite mixed effects being reported overall for the impact of peer support on satisfaction with care, one review cited some possible associated moderating factors such as the number of conversations had between peer supporter and recipient [ 48 ]. Evidence was marginally less mixed for relational outcomes, such as strength of interpersonal relationships and sense of community, as the majority (three) of relevant reviews found evidence in support of peer support [ 21 , 38 , 58 ], although one review found this did not persist long term [ 21 ].

Implementation was investigated in nine reviews [ 23 , 24 , 36 , 39 , 46 , 50 , 55 , 59 , 62 ]. Table 5 shows an overview of implementation outcomes by CFIR domain [ 33 ]. All reviews relevant to this research question were rated as critically low quality based on the adapted AMSTAR 2 rating scale (see Additional file 1 : Appendix 3).

Studies reported generally high acceptability and feasibility of PSW-led interventions [ 36 , 39 , 46 , 50 ]. When planning a peer-led service, co-producing the design of peer support provision with the community and stakeholders was found to be key [ 59 ].

Outer setting

The existence of national policy and funding provisions for employing and retaining PSWs facilitated PSW-led care [ 39 , 46 , 59 ], as did integration of interventions within existing healthcare systems [ 50 ]. However, barriers included power hierarchies [ 39 ], difficulties incorporating PSWs in medical mental health care models [ 24 , 39 , 46 ], interference of work with welfare benefits [ 62 ] and a lack of recognised PSW certification [ 62 ].

Inner setting

A workplace culture emphasising recovery-orientated practice [ 24 , 59 ], and organisational openness and readiness to employ PSWs [ 39 ], was important. Facilitators included strong leadership and support at the highest level [ 46 ], and flexible and understanding employers, especially in times of crisis [ 59 ]. A key facilitator was a supportive, accepting and trusting workplace culture where PSWs occupy a central position and fit in well with other staff members [ 24 ]. A trusting culture allowed the management of risk in a psychologically safe space [ 59 ]; effective communication and collaboration between PSWs and other workers facilitated this [ 24 ], while stigmatising staff attitudes were a barrier [ 62 ]. It was easier to implement PSWs in a more collaborative and less hierarchical service [ 59 ]. There were practical facilitators and barriers for PSWs also, such as access to desk space or administrative data [ 24 , 46 ], time restraints, high caseloads [ 23 , 24 ] and insufficient funding for PSW role [ 24 , 50 ].

Individuals

The professionalisation and legitimisation of the PSW role was seen as important, with associated performance standards and/or a code of ethics [ 24 ] which was linked to rigorous recruitment practices, ensuring parity in the recruitment of PSWs and other staff [ 46 ]. A further facilitator was high levels of competency among peer-counsellors when delivering interventions and having relevant skills and knowledge, e.g. mental health conditions [ 50 ]. PSWs were often required to have recovered from their mental health difficulties [ 55 ] and be able to use their coping skills and resilience to avoid potential negative impacts on their wellbeing [ 24 ]. PSWs reported a conflicted sense of identity between being a ‘peer’ with experience of mental health problems and a ‘professional’ as a barrier to their work [ 62 ]. The use of champions and implementation leaders to drive the set up and maintenance of PSW interventions was reported as a facilitator [ 46 ], as was staff willingness and ability to work with PSWs and accept them as part of the service [ 24 ].

Implementation process

Studies emphasised the importance of comprehensive training for PSWs delivered both prior to starting work and on an ongoing basis, alongside regular clinical supervision [ 24 , 46 , 50 , 55 ] supporting the management of any problems encountered [ 59 ]. PSW roles should be clearly defined [ 24 , 62 ] and training should also be delivered to other members of staff to help them work effectively with PSWs [ 46 ]. Establishing sustainable models of cost and supervision from the outset was key for the longevity of PSW [ 50 ].

Experiences of both the benefits and challenges of peer support were reported in 11 reviews [ 23 , 34 , 39 , 42 , 46 , 49 , 55 , 60 , 61 , 63 , 64 ] from a range of perspectives: PSWs [ 23 , 34 , 39 , 55 , 61 ], service users [ 39 , 55 , 61 ], non-peer staff [ 61 ], peer support group members [ 49 ], and mixed samples which consisted of combinations of PSWs, service users, non-peer staff, carers, mental health organisations, policy makers and peer programme developers [ 23 , 39 , 42 , 46 , 55 , 60 , 61 , 63 , 64 ]. In one review, it was unclear whose perspective was being presented [ 46 ], although this review only contributed to one theme. All reviews providing evidence for this research question were rated as critically low quality based on the adapted AMSTAR 2 rating scale (see Additional file 1 : Appendix 3). We identified 3 overarching themes: (i) what the PSW role can bring, (ii) confusion over the PSW role and (iii) organisational challenges and impact. Table 6 gives an overview of the overarching themes and subthemes (with more detail in Additional file 1 : Appendix 7). The following provides an overview of each overarching theme from the perspective of the different samples (i.e. PSWs, service users, mixed samples).

What the PSW role can bring

Perspective of psws.

PSWs experienced improved wellness and recovery from working in the role, reporting increased self-esteem, personal growth, and social networks [ 23 , 34 , 55 , 61 ]. They benefited in a variety of ways, e.g. the role provided a route back into employment, improving functioning and social inclusion, and allowed them to learn more about their own mental health [ 23 , 34 ]. PSWs also reported increased self-acceptance as they no longer had to hide their mental health issues [ 34 ]. The role was therefore often reported to be mutually beneficial for PSWs and service users [ 34 , 55 ]. PSWs felt it was important that they were role models for service users, being ‘the evidence of recovery’ [ 34 ]. However, working as a PSW could also have a negative impact on the PSWs’ wellbeing and recovery [ 23 , 34 ]. Reasons for this included the role reminding them of their mental health condition and the ‘sick’ label staying with them [ 23 ].

Perspective of service users

For service users, PSWs could be role models, giving them hope of recovery [ 39 , 55 , 61 ]. PSW support normalised and de-medicalised service user experiences [ 55 ]. Lack of judgement from PSWs reduced feelings of self-stigma for service users [ 55 ]. Service users felt empowered by and valued gaining experiential knowledge from PSWs, perceiving them to be more insightful than non-peer staff, and trusting their services [ 39 ]. Service users also built rapport more easily with PSWs than non-peer staff, feeling they were more approachable and had greater empathy than non-peer staff [ 39 , 61 ]. However, some service users reported that PSWs are not role models and found it challenging to view them as professionals or fully trust their knowledge, due to their lack of training and concerns about their mental health history [ 39 , 61 ].

Perspective of non-peer staff

From working with PSWs, non-peer staff developed increased empathy towards service users and a belief in recovery [ 61 ].

Perspective of peer support group members

Forming relationships in peer support groups and having their experiences validated by others was valuable for recovery [ 49 ]. However, group members could feel isolated when other members’ experiences contrasted with their own [ 49 ].

Perspective of mixed samples

PSWs were perceived to be role models, providing valuable support to service users and giving them hope of recovery [ 60 , 64 ]. Working as a PSW could enable service users to find a role in the community, beyond the identity of being a ‘patient’ [ 61 ]. PSWs could build trust-based pathways to function as a bridge between service users and non-peer staff [ 64 ]. Within teams, working with PSWs could improve recovery-oriented care and PSWs carried out various roles, such as providing psychosocial support, advocating for service users, providing insights based on their lived experiences [ 64 ]. For mental health organisations, PSW roles decreased stigma towards mental health problems and set a positive example [ 61 ]. However, there were fears that the PSWs’ mental health condition could impact the provided support, such as increased PSW absenteeism which could increase non-peer staff caseloads and concerns that service users’ and PSWs’ could experience distress due to exposure to difficult (‘triggering’) content [ 42 , 55 , 60 ]. PSWs experienced pressure due to the perception that they were pioneers, leading to expectations, e.g. failure could reduce future PSW opportunities [ 64 ]. There was also concern that PSWs lacked mental health knowledge, beyond their own experience [ 64 ].

Confusion over the PSW role

A lack of clarity about the PSW job description led PSWs to feel the role was undervalued and tokenistic and meant they felt confused in their role. This impacted their perception of competence which affected their recovery and led to uncertainty in their responsibilities with service users [ 23 , 34 ]. PSWs also found the transition from service user to PSW and knowing where to draw the line between friend and service provider to be challenging [ 23 , 61 ]. Linked to this, their dual identity as a service user and provider could be a source of stress. For example, it meant they could closely connect with service users who had similar difficulties to their own, but this could also be triggering and lead to a recurrence of the PSWs’ own mental health issues [ 34 ]. PSWs expressed varying views on disclosing their recovery story [ 34 , 39 ]. For some, sharing elements of their story was linked to their own personal recovery [ 34 ]. However, other PSWs felt fearful of disclosure, e.g. they were concerned about being labelled ‘mentally ill’ and service users not trusting them [ 39 ].

A lack of clarity on the PSW role could lead service users to view the role as informal, leading to negative perceptions of the PSW services. Perceptions of tokenism of peer support could lead to the content of the PSW intervention ‘feeling irrelevant’ [ 39 ].

PSWs and non-peer staff found the PSW role to be ambiguous, e.g. the role was not clearly defined [ 63 ] and job descriptions were ‘vague’ [ 64 ]. Although this gave flexibility to define the role [ 64 ], it also led to challenges. Some PSWs felt they were expected to develop the role over time and received insufficient training, which hampered service delivery and could result in perceptions that PSWs were tokenistic [ 42 , 63 , 64 ]. Uncertainty about the role also led to a lack of support from non-peer staff [ 63 ]. Relatedly, there was confusion for PSWs over when/with whom to disclose their lived experience [ 63 , 64 ]. Some PSWs felt vulnerable and were reluctant to disclose, but disclosure could build trust with service users, enabled PSWs to be recovery role models, and could educate non-peer staff on alternative views [ 63 , 64 ]. Disclosure was also felt to require discretion when fitting with professional relationships. However, ‘professionalisation’ of PSWs may not challenge the existing boundaries (e.g. traditional hospital-based boundaries which could make it difficult for the sharing of lived experience to be valuable), when challenging these boundaries could change culture [ 63 , 64 ]. The transition for PSWs from patient to staff was challenging, e.g. non-peer staff were concerned about the PSW becoming unwell, making PSWs feel like they are being treated like patients [ 63 , 64 ]. There were issues around boundaries, including whether PSWs should relate to service users as friends or service users [ 63 ].

Organisational challenges and impact

PSWs experienced a lack of support and training for their role, potentially related to unclear job descriptions, and insufficient supervision [ 23 , 34 ]. This meant that PSWs struggled to develop the skills for their roles, including to work with service users with more complex needs than their own experiences [ 23 ]. Although there were some contrasting views, PSWs were concerned that they received low pay which made them feel that they were not valued, and they perceived themselves to be ‘cheap labour’ [ 23 , 34 , 61 ]. Some PSWs felt accepted in their teams however others experienced negative and rejecting non-peer staff attitudes [ 23 , 34 , 61 ]. For example, PSWs reported not being invited to social events and being treated like patients [ 61 ]. Consequently, some PSWs felt excluded, that their roles were tokenistic and experienced self-stigma [ 23 , 34 ]. PSWs as part of the newer recovery model reported challenges around integrating into traditional treatment models, e.g. where doctors spent the least time with service users but held the majority of power and decision making for service users. PSWs were expected to contest the traditional treatment model in support of a recovery focus, e.g. by their presence or in some cases being openly challenging, and this clash between old and new treatment models could lead to friction [ 23 ].

There was a fear that ‘cheap labour’ provided by PSWs may lead to fewer non-peer staff positions [ 61 ].

PSWs often received low pay, which led to role dissatisfaction for PSWs, suggesting the job was tokenistic or the role was unclear [ 63 , 64 ]. One reason for low pay was due to PSWs not requiring certification (i.e. specific qualifications, which e.g. a social worker would require) [ 63 ]. Some PSWs were positive about certification but others felt it could conflict with the grassroots ethos of peer support. However, there was the view that lived experience was not solely sufficient to work in interprofessional teams [ 64 ]. Despite this, supervision and support were often not offered to PSWs leading to risks [ 60 , 64 ].

There were challenges in PSW relationships with non-peer staff which could lead to a lack of support and hostility from non-peer staff. Non-peer staff felt threatened that they may be replaced by PSWs [ 64 ], were uneasy about working with people they previously treated [ 46 ], were concerned about the effectiveness of peer support [ 39 ], and felt expectations to support PSWs, increasing their workload [ 42 ]. This undermined the role of PSWs, e.g. they were subsequently given fewer responsibilities [ 39 ]. For PSWs, they wanted to challenge stigma by taking on more responsibility but high, varying workloads could jeopardise relationships with non-peer staff and team hierarchies hindered their ability to challenge clinically dominant ways of thinking [ 64 ].

A final theme was the perception that service users should be able to choose among PSWs as service providers [ 60 ].

Summary of key findings

An overview and summary of the key findings for each research question is presented in Table  7 .

Key findings

Our umbrella review of 35 reviews explored the effectiveness, implementation and experiences of peer support for mental health.

Effectiveness was reported in 23 reviews. Many reviews reporting effectiveness data reported no effect of peer support on a range of outcomes, mirroring the findings from other reviews [ 9 , 66 ] including those focusing on other types of peer support (e.g. online peer support for young people) [ 67 ]. However, there was consistent evidence from meta-analyses that peer support may improve the clinical outcomes of perinatal depression and risk of hospitalisation of adults with severe mental illness, as well as recovery outcomes, and self-efficacy and stigma-related outcomes. Mixed meta-analytic results were found for the clinical outcomes of overall psychiatric symptoms in adults with SMI, psychosis symptoms, length of hospital stay and patient activation, and for psychosocial outcomes such as hope, empowerment, and quality of life. There was no meta-analytic evidence for improvements in relational support. Evidence from systematic reviews without meta-analysis similarly gave a mixed picture regarding psychosocial and clinical outcomes, but indicated more consistent evidence that peer support has a positive impact on recovery, suicidal ideation, and, to some degree, satisfaction with care.

Many possible sources of heterogeneity across the included reviews could contribute to the mixed findings in this study, such as low-quality methodologies, differences in the populations included, and poor specification of peer support roles or the content of interventions delivered. One important potential contributor to our mixed results is that the primary studies contributing to the included reviews often varied in the type of control groups they considered, for example studies with treatment as usual, active controls and waitlist controls were often reviewed within the same paper. As such, it was not possible to determine whether peer support is effective in comparison to certain types of care provision but not others. In a similar vein, we could not perform subgroup analysis to determine whether specific forms of peer support are more effective on certain populations as most reviews with meta-analyses involved a combination of different formats and a range of participant groups. Nevertheless, there was some indication that differences in the format of peer support may impact its effectiveness on empowerment, as the two meta-analyses involving individual peer support alone found a positive effect on empowerment, but the two looking at group-based peer support alone did not. However, further research is needed to adequately address such questions.

Although this overview of quantitative evidence does not give unequivocal support for peer support on a variety of outcomes, the mixed results must be understood not only in the context of heterogeneity of the quantitative research conducted thus far, but with regard to the qualitative evidence documenting strong support for this intervention (as discussed in more detail below). Given that the implementation of peer support in mental health services is still relatively rare and highly variable, many of the trials conducted thus far may have tested peer support in environments where it is not fully embedded in the organisation and culture. Indeed, peer support may have positive impacts on the operation of mental health services that have not been measured as quantitative outcomes in existing trials—such as a stronger culture of person-centred care. More consistent quantitative results demonstrating the benefit of peer support may increasingly emerge as it becomes better integrated in the mental health care system.

We identified several factors reported to be important for the successful implementation of peer support, which were summarised and structured using the CFIR. These factors included adequate training and supervision for PSWs, a recovery-oriented workplace structure, strong leadership and a supportive and trusting workplace culture with effective collaboration between PSWs and non-peer staff. Barriers to peer support being implemented effectively included a lack of time, resources, and appropriate funding, and a lack of recognised PSW certification. Policy, research and campaign groups have advocated implementation approaches in line with these findings, for example, ImROC (implementing Recovery through Organisational Change) [ 14 , 68 ], who support peer support implementation globally and international competence frameworks from New Zealand [ 69 , 70 ], outline recovery focus as a core principle of peer support and emphasise the importance of training and ongoing professional development; peer support practice guidelines in the USA outline the importance of and give guidelines for supervision [ 71 ]. Formalised career pathways for PSWs [ 72 ] may help to address some of the identified barriers to effective implementation of peer support work, although these are still early in their development [ 68 ].

Experiences of peer support were from a range of perspectives (e.g. PSWs, service users, non-peer staff) and were organised under three main themes. The benefits of peer support for PSWs, service users and non-peer staff were expressed in many reviews; however, there were also conflicting and challenging experiences of the role. The mental health experience of PSWs was viewed as valuable, but also subject to some stigmatising views. For PSWs, the role could improve their personal wellness and recovery, providing a route back into employment and improving functioning, and provide service users with role models of recovery. The reciprocal benefits of peer support have also been highlighted as an advantage of peer support in resources developed by NHS England [ 19 ]. However, PSWs reported the ‘sick’ label stayed with them in the role, with non-peer staff at times concerned that PSWs mental health would impact their work, and some service users reported that they found it challenging to trust PSWs knowledge due to their lack of training and mental health history. A key experience, which became the core of our second theme, was the ambiguity of the PSW job description, including lack of clarity over boundaries with service users and when to disclose PSWs’ personal experiences. This ambiguity meant that the role was flexible, but also led to the perception that it was tokenistic and left PSWs feeling confused which impacted their own recovery. IMROC recommend the prioritisation of clear roles when implementing peer support [ 68 ]. Professional accreditation can counter the view of peer support as tokenistic, e.g. the UK Peer Support Competence Framework outlined by the Royal College of Psychiatrists [ 73 ] and the Canadian Peer support Accreditation and Certification, a national standard endorsing peer support work as a valuable career, developed in 2017 by PSWs themselves [ 74 ]. The final theme ‘organisational challenges and impact’ included experiences such as PSWs receiving inadequate support, training and supervision, and receiving low pay, leaving them feeling undervalued. Some non-peer staff attitudes were also a reported issue; while some PSWs felt accepted within teams, others experienced negative and rejecting non-peer staff attitudes, such as being treated as patients and not being invited to staff social events. Organisations should prepare, structurally and culturally, for the introduction of PSWs in order to ensure PSW wellbeing and reduce the risk of absences due to sickness [ 68 , 75 ].

Strengths and limitations

We conducted a comprehensive search of several relevant databases and identified a large number of reviews for inclusion, providing the first detailed summary of review findings relating to effectiveness, implementation and experiences of peer support. We also had consistent involvement of researchers with lived experience of mental health and peer support delivery and receipt throughout the design, data screening and extraction, analysis and synthesis, and manuscript drafting for this paper, which allowed lived experience priorities and experiences to guide our approaches to data and our decision making throughout.

We aimed to focus our review on paid peer support; however, this information was underreported in the reviews, and even when reported, interventions were often grouped with peer support interventions that did not fully meet our eligibility criteria (e.g. were unpaid). We also synthesised data from studies where payment status of PSWs was ambiguous, i.e. not reported. This limits our ability to draw firm conclusions around paid peer support specifically, as a significant portion of the data synthesised was from studies investigating unpaid or voluntary peer support. Another limitation was the lack of involvement of people with lived experience in the included reviews, with involvement reported in only one review [ 57 ]. Given the service user-led origins of peer support, future reviews should ensure involvement of people with lived experience. This is addressed in more detail later in this paper. Most included reviews were appraised by the AMSTAR 2 as low or critically low (97%) quality with only one review appraised as high quality. Although the low quality of reviews is a limitation, we aimed to report an overview of all current evidence for peer support to inform policy makers and healthcare practitioners, therefore to maximise the evidence base, we synthesised the reviews scored as ‘critically low quality’. Our ratings are also in line with a prior umbrella review of peer support which rated 87% of reviews as critically low quality and the remainder as low quality, but reported outcomes from all reviews [ 66 ].

Beyond the aforementioned limitations regarding variation in studies within each review, there is also a loss of granular detail through the umbrella review process of summarising data across reviews, which themselves contain many studies which have been summarised. The person-centred nature of peer support may mean that there are meaningful outcomes for the service user which are not easily captured in standard outcome measurement tools or recognised as clinically significant. Variation in peer support roles across studies may have contributed to the contradictions in our findings for RQ3, e.g. the challenges around PSW roles being ambiguous, but also the reported benefits of a flexible role.

A strength of our review was our broad inclusion criteria, for example, for qualitative data on experiences of peer support we reported data from the perspectives of service users, non-peer staff and PSWs. Though some data was reported separately by role, there were studies where experiences were reported together, and these perspectives were difficult to disentangle. Finally, we did not conduct a formal meta-synthesis of the qualitative experiences data; therefore, some detail may have been missed.

Implications for practice

Peer support may be effective at improving some clinical outcomes, self-efficacy and recovery outcomes for some people and could augment the standard service range. Certain groups may benefit from peer support more than others; evidence was strongest for depression outcomes within perinatal populations, but extremely variable for other populations. Peer support may differ in effectiveness depending on population needs and characteristics. PSWs need adequate pay, clear role descriptions and guidelines (e.g. about boundaries and disclosure), ongoing training and supervision, and opportunities for progression. Attitudes about peer support held by non-peer staff may significantly support or impede the implementation and experience of PSWs, and non-peer staff may require training about PSW roles and how to work collaboratively with PSWs. Culture, hierarchical structure and staff acceptability of peer support impact implementation and experience of peer support—structural and cultural change may be required for peer support to succeed, e.g. ensuring a recovery-oriented care model is operating in the service.

Implications for policy

Successful implementation of PSWs in healthcare settings is likely to require a coproduction approach with clearly defined PSW roles, a receptive hierarchical structure and staff, strong leadership and appropriate training (for PSWs and staff) with clinical and/or peer supervision alongside safeguarding. Issues relating to cost, lack of time and lack of resources are key considerations for service providers aiming to implement PSW that is sustained and effective within services. Additionally, Services could benefit from clear, coproduced guidelines, outlining the steps that are most likely to lead to successful PSW implementation.

Implications for research

Future primary and secondary research could usefully explore the differences in efficacy, implementation and experiences in paid PSW over time as it becomes more established; an important distinction as there are likely to be differences in these outcomes as the role of PSW develops. Such studies could consider using more personalised outcome measures such as goal-based outcome measurement [ 76 ]. Current PSW roles are still poorly defined and PSW content, including PSW variations (such as whether PSWs should deliver structured or more loosely structured, informal interventions, or whether interventions should vary according to need and context), need further exploration. Realist investigations around what works for whom, how and in which contexts would uncover more fine-grained detail on the specific contexts and mechanisms that explain these differences. Very few reviews included in this umbrella review reported lived experience researcher leadership or involvement in the undertaking of the study. It is imperative for future research in this area to appropriately reflect the priorities of those who are directly involved in PSW, either as providers or as service users. As the number of PSWs increases and more formalised roles are created, positive impact may not be restricted to outcomes of those supported by PSWs, but also to the functioning of services at an organisational level [ 68 ]. Further research is needed to evaluate how teams function with and without PSWs in order to understand how they may impact experiences through changes at a system level [ 68 ].

Our umbrella review has summarised data from 35 reviews on the effectiveness, implementation, and experiences of peer support for mental health. Although we attempted to focus solely on paid peer support, this detail was often not reported in the reviews. While data on effectiveness was mixed, there was some evidence of improvements on outcomes including depression, particularly perinatal depression, self-efficacy, and recovery, illustrating the potential benefits of wider PSW implementation across mental health services. Good implementation of peer support depends on co-design with people with lived experience, clear job descriptions, a recovery-oriented workplace culture, strong leadership, appropriate training for PSWs and staff , and supervision for PSWs. However due to limited information on cost or cost-effectiveness, we are unable to draw conclusions around resources required to implement PSWs. Experiences of peer support were from a range of perspectives. Peer support was mutually beneficial for PSWs’ and service users’ wellbeing and recovery and PSWs became role models. However, at times PSW roles were ambiguous, this meant that the role was flexible but could also lead to confusion which could impact PSWs own recovery. Potential strategies to successfully implement peer support include that the PSW roles should be clear, PSWs should be appropriately trained and paid, as well as supported and supervised within a trusting and accepting workplace structure and culture that advocates for a recovery-oriented model of care.

Lived experience commentary, written by LM and KM

This study provides a useful summary of the available research on peer support. By providing an overarching review of 35 reviews including 426 available studies, the paper brings together the knowledge on a topic of growing importance and understanding of the experiences, effectiveness, and implementation of peer support. However, this evidence is limited to ‘paid peer support workers’ included in data from academic literature of systematic reviews.

The nature of an umbrella review means that the systematic reviews themselves are synthesised, limiting our ability to look at specific details in the primary studies, for example to look for evidence of lived experience involvement or co-authorship or demographics of participants. The papers within the review are likely to have originated from traditionally funded research enquiries, and an umbrella review potentially magnifies academic or clinical perspectives over user voices and interests. While this is a frustration in any mental-health-related topic, this is particularly concerning in relation to peer support, with its origins in our user-led history.

The roots in user-led peer support are also overlooked when limiting the studies to paid peer support work. Although they might use the same language of mutuality and reciprocity, the two feel different. We are hesitant to suggest that we would prefer the skills and expertise of our supporters to be voluntary and unpaid; we strongly believe their expertise should be valued and funded. But there is something magical about informal peer support which can be lost when it is over-policed in bureaucratic cultures. Additionally, with studies included in the review dating back to 1979, we question how relevant these studies are in informing England’s evolving peer support landscape.

A crucial area of future research is exploring what type of peer support works best for whom and in what circumstances, and how we can deliver this. Furthermore, we need to better understand how NHS cultures can be supported to value the expertise that originates in our lived experience, including the marginalised experiences which have been disproportionately represented in mental health services.

Availability of data and materials

The data used and/or analysed during the current study are available from the corresponding author on reasonable request.

Abbreviations

A MeaSurement Tool to Assess systematic Reviews

Consolidated Framework for Implementation Research

Implementing Recovery through Organisational Change

Lived Experience Working Group

Population, Intervention, Comparator group, Outcome

Peer support worker

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Acknowledgements

This work is supported by the NIHR UCLH BRC.

This study is funded by the National Institute for Health and Care Research (NIHR) Policy Research Programme. The views expressed are those of the author(s) and not necessarily those of the NIHR or the Department of Health and Social Care.

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Ruth E. Cooper and Katherine R. K. Saunders are joint first-authors.

Authors and Affiliations

NIHR Mental Health Policy Research Unit, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK

Ruth E. Cooper, Katherine R. K. Saunders, Jessica Griffiths, Ruth Stuart & Alan Simpson

NIHR Mental Health Policy Research Unit, Division of Psychiatry, University College London, London, UK

Anna Greenburgh, Rebecca Appleton, Phoebe Barnett, Sophie M. Allan, Brynmor Lloyd-Evans & Sonia Johnson

Centre for Outcomes Research and Effectiveness, Research Department of Clinical, Educational and Health Psychology, University College London, London, UK

Phoebe Barnett

National Collaborating Centre for Mental Health, Royal College of Psychiatrists, London, UK

University of East Anglia, Norwich, UK

Sophie M. Allan

MHPRU Lived Experience Working Group, London, UK

Prisha Shah, Karen Machin, Tamar Jeynes, Lizzie Mitchell, Beverley Chipp & Stephen Jeffreys

Florence Nightingale Faculty of Nursing, Midwifery and Palliative Care, London, UK

Alan Simpson

Camden and Islington NHS Foundation Trust, London, UK

Sonia Johnson

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Contributions

All authors (RC, KS, AG, PS, RA, KM, TJ, PB, SA, JG, RS, LM, BC, SJ, BLE, AS, SJ) substantially contributed to the conception or design of this study. Data acquisition was undertaken by: KS, RC, JG, RS, RA, KM, PS, SA, PB. The data were synthesised and interpreted by: KS, AG, RA, PS, KM, TJ, and RC. KS and RC led on drafting the manuscript with input and/or editing by all other authors (AG, PS, RA, KM, TJ, PB, SA, JG, RS, LM, BC, SJ, BLE, AS, SJ). All authors (RC, KS, AG, PS, RA, KM, TJ, PB, SA, JG, RS, LM, BC, SJ, BLE, AS, SJ) read and approved the final manuscript.

Authors’ Twitter handles

Twitter handles: @soniajohnson (Sonia Johnson); @cityalan (Alan Simpson); @MentalHealthPRU (Mental Health Policy Research Unit).

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Correspondence to Ruth E. Cooper or Katherine R. K. Saunders .

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Competing interests.

KM is a Director of With-you Consultancy Ltd who provide peer support training and consultancy. All other authors declare no competing interests.

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Supplementary Information

Additional file 1: appendix 1..

Prisma checklist [ 29 ]. Appendix 2. Full search strategy. Appendix 3. AMSTAR2 ratings. Appendix 4. Excluded studies following full text screening, with reasons. Appendix 5. Study overlap. Appendix 6. Effectiveness of peer support outcomes: results for non-meta-analysis results. Appendix 7. Experiences of peer support (detailed themes).

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Cooper, R.E., Saunders, K.R.K., Greenburgh, A. et al. The effectiveness, implementation, and experiences of peer support approaches for mental health: a systematic umbrella review. BMC Med 22 , 72 (2024). https://doi.org/10.1186/s12916-024-03260-y

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