Co-Produce, Co-Design, Co-Create, or Co-Construct—Who Does It and How Is It Done in Chronic Disease Prevention? A Scoping Review

The Right Advice, from the Right Person, in the Right Way: Non-Engaged Consumer Families' Preferences for Lifestyle Intervention Design Relating to Severe Obesity in Childhood

Family-based lifestyle interventions for children/adolescents with severe levels of obesity are numerous, but evidence indicates programs fail to elicit short- or longer-term weight loss outcomes. Families with lived experience can provide valuable insight as we strive to improve outcomes from programs. Our aim was to explore elements that families desired in a program designed to treat severe levels of obesity in young people. We recruited a cross-sectional sample of 13 families (parents and young people) who had been referred but had not engaged with the state-wide Perth Children's Hospital, Healthy Weight Service (Perth, Australia), between 2016 and 2018. Utilizing semi-structured interviews and reflexive qualitative thematic analysis, we identified two broad themes, (1) bridging the gap between what to do and how to do it, and (2) peers doing it with you. The first theme reflected parents' and young people's feelings that programs ought to teach specialist-designed practical strategies utilizing non-generic information tailored to address the needs of the family, in a collaboratively supportive way, and encourage young people to learn for themselves. The second theme reflected the importance of social connection facilitated by peer support, and intervention programs should be offered in a group format to foster inclusion. Families indicated a willingness to engage in tertiary intervention programs but desired support from specialized health professionals/programs to be tailored to their needs, sensitive to their experiences and challenges and provide useful practical strategies that support the knowledge-to-action process.

Assessing the Impact of Behavioral Sciences Interventions on Chronic Disease Prevention and Management: A Systematic Review of Randomized Controlled Trials

Studies have highlighted the importance of applying Behavioral Sciences interventions to develop equity in the prevention of chronic diseases in the public health domain. Our study aims to assess the evidence of this influence. We undertook a systematic review study using the electronic databases PubMed, Web of Science, Scopus and Cochrane, searching for work published between 2013 and 2023. The research analyzed the influence of Behavioral Sciences intervention studies on public health. This review was registered and published in PROSPERO, registration number CRD42023412377. The systematic search identified 2951 articles. The review analyzed 26 studies. The quality assessment of the articles showed an overall average of 74%, with the majority of studies being of high quality. The interventions with the best evidence for chronic diseases used framing messages, nudges and vouchers. Messages with incentives also showed satisfactory evidence. The most prevalent outcomes were related to screening tests and patient adherence to treatment. The current state of decision-making remains mainly at the patient level, with potential for further exploration of the roles of healthcare professionals and decision-makers in future research efforts. Limitations relate to the heterogeneity of the study sample, which hinders a more precise analysis of specific interventions and outcomes in chronic diseases.

What does 'co-production' look like for food system transformation? Mapping the evidence across Transforming UK Food Systems (TUKFS) projects

Co-production is a collaborative way of working which emphasises the exchange of diverse forms of knowledge in an equal partnership for equal benefits. Co-produced research is a key strategic aim of the UK Research and Innovation (UKRI) Transforming UK Food Systems (TUKFS) Strategic Priorities Fund; this research programme brings together researchers, policymakers, industry and communities to create positive change in the way food is produced, accessed and consumed. However, more generally, there are diverse understandings of co-production and a lack of consensus on what 'good practice' looks like. Therefore, this study aimed to identify and map examples of co-production methods employed across the TUKFS programme. Two creative workshops (n = 15 participants), conversations with TUKFS researchers and stakeholders (n = 15), and systematic analysis of project documents were used to critically explore co-production activities within six TUKFS projects. A range of co-production activities were identified. Findings highlighted areas of 'messiness' and complexity, challenges associated with applying co-production approaches and practical solutions. Four key shared principles for co-production were identified: (1) Relationships: developing and maintaining reciprocity-based partnerships; (2) Knowledge: recognising the contribution of diverse forms of expertise; (3) Power: considering power dynamics and addressing imbalances; and (4) Inclusivity: ensuring research is accessible to all who wish to participate. Opportunities for reflection and reflexivity were considered crucial across all these areas. Findings contribute important insights towards a shared conceptual understanding of co-production for food system transformation research. This paper makes recommendations for researchers, practitioners, academic institutions and funders working in this area of research and practice.

Reducing the carbon footprint of cataract surgery: co-creating solutions with a departmental Delphi process

BACKGROUND

Climate change is arguably the greatest threat to global health of the 21st century. Although cataract surgery is a major contributor to global greenhouse gas emissions, recent literature review identified a paucity of evidence-based strategies for improving the environmental impact of cataract services. Our study aimed to assess the effectiveness of a departmental Delphi process for improving cataract services' environmental sustainability.

METHODS

All members of ophthalmology theatre teams in a UK teaching hospital were invited to participate in a three-stage Delphi process. Team members were surveyed for suggestions for reducing the department's environmental impact. Suggested interventions were refined during a plenary face-to-face discussion and ranked. The highest ranked interventions were combined into a mutually agreed action plan. Data on the economic and environmental cost of cataract services was collected prior to and six months after the Delphi process using the Eyefficiency mobile application.

RESULTS

Twenty-three interventions were suggested by a range of staff cadres. Interventions were ranked by 24 team members. The 2nd, 4th, 5th, 8th and 11th ranked interventions were combined into an "Eco-packs" project in collaboration with suppliers (Bausch + Lomb), saving 675 kg of waste and 350 kg of CO2 equivalent annually.

CONCLUSIONS

The Delphi process is an effective method for provoking departmental engagement with the sustainability agenda that we would encourage all ophthalmology departments to consider utilising. The baseline per case CO2 equivalent measured in our department was reproducible and could serve as a maximum benchmark to be improved upon.

Ready, set, co(produce): a co-operative inquiry into co-producing research to explore adolescent health and wellbeing in the Born in Bradford Age of Wonder project

BACKGROUND

Co-production of research with communities and stakeholders is recognised as best practice, but despite this, transparent reporting and reflective accounts on co-producing research is lacking. Born in Bradford Age of Wonder (AoW) is a large longitudinal health research project, following the health trajectories of up to 30,000 young people across the Bradford district; moreover, AoW has been entirely co-produced with teachers, parents, and young people. This paper describes the co-production of the Born in Bradford Age of Wonder (AoW) project and shares general reflections on co-production from peer researchers involved in co-producing AoW.

METHODS

A co-operative inquiry (CI) approach was used to gather written reflections on co-production from ten peer researchers (one teacher, one parent, eight young people) involved in co-producing the AoW project. Written reflections were collected and rough "themes" were identified using thematic analysis.

RESULTS

Four key 'themes' were identified: (1) promoting young people's voice and views (2) identifying impacts of co-production, (3) fostering a collaborative ethos, and (4) suggested improvements to the co-production work in AoW. Peer researchers' reflections highlighted how co-production can positively impact research projects such as AoW, whilst also holding broader benefits including giving young people a voice, facilitating their personal development, and fostering a collaborative ethos both within AoW and with partner organisations. Suggested improvements to AoW co-production included supporting greater numbers of young people and researchers to engage in co-production, organising more regular sessions, and establishing clearer communication channels.

CONCLUSIONS

Peer researchers' reflections highlight positive impacts of engaging in co-production, both for research projects (including AoW) and for peer researchers' personal and professional development. That said, continued efforts are needed in AoW to meet young people's needs and interests, maintain trusting relationships, and foster sustained growth of co-production efforts within and beyond the AoW project. Evaluation of AoW co-production, along with wider partnership building are key to these efforts.

A systematic review and meta-analysis of the effectiveness of co-designed, in-person, mental health interventions for reducing anxiety and depression symptoms

BACKGROUND

Co-design is recommended in mental health fields and has been associated with improved intervention efficacy. Despite its growing popularity, syntheses of evidence on the effectiveness of co-designed interventions are scarce, and little is known about their impact on anxiety and depression.

METHODS

The purpose of this systematic review and meta-analysis was to consolidate evidence on the effectiveness of in-person, co-designed mental health interventions for reducing anxiety and depression symptoms. An exhaustive search was conducted across six electronic databases (PubMed, PsycINFO, Embase, CINAHL, CENTRAL, and ProQuest) and grey literature. Criteria for inclusion comprised studies utilizing randomized or quasi-randomized methods, implementing non-digital/in-person, co-designed interventions for mental health enhancement, and assessing anxiety and/or depression. Intervention impacts were evaluated using random-effects meta-analyses.

RESULTS

The review identified 20 studies, with only three using the term 'co-design'. Other terminologies included 'co-developed' (n = 2), 'co-produced' (n = 2), and 'CBPR' (n = 11). Seventeen studies exhibited moderate risk of bias, while three demonstrated high risk. Meta-analyses demonstrated a moderate non-significant effect size of 0.5 (95 % CI: -0.8, 1.08; p = 0.08) on depression outcomes, and a small non-significant effect size of 0.12 (95 % CI: -0.1, 0.33; p = 0.23) on anxiety outcomes.

LIMITATIONS

The majority of studies lacked sufficient statistical power to detect between-group differences. Following GRADE criteria, confidence in estimates was low.

CONCLUSIONS

Notwithstanding widespread enthusiasm for co-design, the current evidence base is inadequate to confirm the impact of in-person, co-designed mental health interventions on anxiety and depression. More full-scale evaluation trials of higher quality are urgently needed, along with uniform terminology and measurement.

A collaborative approach to designing an online nutrition education program for people with multiple sclerosis

PURPOSE

People with multiple sclerosis (pwMS) want disease-specific dietary advice to reduce the confusion around diet. This study used co-design principles to develop an online nutrition education program for pwMS.

METHODS

Mixed-methods (multiphase sequential design). Phase 1: online survey (n = 114 pwMS) to explore preferred content and characteristics of a nutrition program and develop a draft program. Phase 2: feedback on the draft program from stakeholders (two meetings; n = 10 pwMS and multiple sclerosis (MS) health professionals) and pwMS (two workshops; n = 6) to produce a full program prototype. Phase 3: cognitive interviews (n = 8 pwMS plus 1 spouse) to explore acceptability and ease of comprehension of one module of the program, analysed using deductive content analysis.

RESULTS

Preferred topics were included in the program, which were further developed with consumer feedback. Cognitive interviews produced four themes: (1) positive and targeted messaging to motivate behaviour change; (2) "not enough evidence" is not good enough; (3) expert advice builds in credibility; and (4) engaging and appropriate online design elements are crucial.

CONCLUSIONS

Positive language appears to improve motivation to make healthy dietary changes and engagement with evidence-based nutrition resources. To ensure acceptability, health professionals can use co-design to engage consumers when developing resources for pwMS.IMPLICATIONS FOR REHABILITATIONCo-designed nutrition education programs can help people achieve high-quality diets in line with recommendations, but very few programs exist for people with multiple sclerosis (MS), and none were co-designedThe participatory research in this study was instrumental in ensuring that important information regarding program acceptability was identifiedCo-design can ensure that the language is appropriate for the target audience, and positive language appeared to improve motivation in people with MS to engage with the online nutrition education programWhere practical and feasible, health professionals should collaborate with MS consumers when developing resources, and use positive, empowering language.

Co-design of 'Ways of Being', a web-based experience to optimise online arts and culture for mental health in young people

AIMS AND METHOD

We aimed to co-design an intervention optimising the benefits of online arts and culture for mental health in young people for subsequent testing in a trial. Co-design followed the double diamond phases of design, discover, define, develop and deliver.

RESULTS

Navigating the views of all co-designers to produce a testable resource demanded in-depth understanding, and frequent iterations in multiple modalities of the theoretical basis of the intervention, amplification of youth voice and commitment to a common goal.

CLINICAL IMPLICATIONS

Co-design with a broad range of collaborators with a shared vision was valued by young co-designers and produced an effective intervention. Co-design allowed the theoretical basis to be followed and refined to create an engaging, practical and testable web experience, aiming to optimise the mental health benefits of online arts and culture for young people in a randomised controlled trial.

Using formative research to inform a mental health intervention for adolescents living in Indian slums: the ARTEMIS study

BACKGROUND

Adolescents are vulnerable to stressors because of the rapid physical and mental changes that they go through during this life period. Young people residing in slum communities experience additional stressors due to living conditions, financial stress, and limited access to healthcare and social support services. The Adolescents' Resilience and Treatment nEeds for Mental Health in Indian Slums (ARTEMIS) study, is testing an intervention intended to improve mental health outcomes for adolescents living in urban slums in India combining an anti-stigma campaign with a digital health intervention to identify and manage depression, self-harm/suicide risk or other significant emotional complaints.

METHODS

In the formative phase, we developed tools and processes for the ARTEMIS intervention. The two intervention components (anti-stigma and digital health) were implemented in purposively selected slums from the two study sites of New Delhi and Vijayawada. A mixed methods formative evaluation was undertaken to improve the understanding of site-specific context, assess feasibility and acceptability of the two components and identify required improvements to be made in the intervention. In-depth interviews and focus groups with key stakeholders (adolescents, parents, community health workers, doctors, and peer leaders), along with quantitative data from the digital health platform, were analysed.

RESULTS

The anti-stigma campaign methods and materials were found to be acceptable and received overall positive feedback from adolescents. A total of 2752 adolescents were screened using the PHQ9 embedded into a digital application, 133 (4.8%) of whom were identified as at high-risk of depression and/or suicide. 57% (n = 75) of those at high risk were diagnosed and treated by primary health care (PHC) doctors, who were guided by an electronic decision support tool based on WHO's mhGAP algorithm, built into the digital health application.

CONCLUSION

The formative evaluation of the intervention strategy led to enhanced understanding of the context, acceptability, and feasibility of the intervention. Feedback from stakeholders helped to identify key areas for improvement in the intervention; strategies to improve implementation included engaging with parents, organising health camps in the sites and formation of peer groups.

TRIAL REGISTRATION

The trial has been registered in the Clinical Trial Registry India, which is included in the WHO list of Registries, Reference number: CTRI/2022/02/040307. Registered 18 February 2022.

A reflection on the co-design approach to the development of the Medway Can campaign; a whole systems approach to obesity prevention using COM-B

Obesity is one of the highest metabolic risk factors associated with morbidity and mortality in the UK, with two-thirds of adults in the UK classed as overweight or obese. Whole systems approaches can be effective in tackling this public health challenge through stakeholder and key partner engagement. This article describes the co-design process for a social marketing obesity prevention campaign taking a whole systems approach based on the COM-B model of behaviour change. Development of social marketing campaigns through Agencies is often hampered by rapid turnaround and short timescales; we highlight how drawing on existing knowledge and co-design with beneficiaries can support the design, delivery and implementation of a social marketing behaviour change campaign.

Evaluation of an implementation support package to increase community mental health clinicians' routine delivery of preventive care for multiple health behaviours: a non-randomised controlled trial

BACKGROUND

People with a mental health condition are more likely to engage in risk behaviours compared to people without. Delivery of preventive care to improve such behaviours is recommended for community mental health services, but inadequately implemented. This study assessed the effectiveness of an implementation support package on clinicians' delivery of preventive care (assessment, advice, referral) for four risk behaviours (tobacco smoking, harmful alcohol consumption, physical inactivity, inadequate fruit and vegetable intake) compared to no implementation support. The participatory approach to developing the support package, and fidelity of the implementation strategies, are also described.

METHODS

A non-randomised controlled trial was undertaken in 2019-2020 with two community mental health services (control and target) in one health district in New South Wales, Australia. A 4-month support package consisting of multiple implementation strategies was delivered to one site following a two-phase participatory design process. Five implementation strategies were proposed to service managers by researchers. After consultation with managers and clinicians, the final implementation support package included four strategies: training and education materials, enabling resources and prompts, client activation material, and audit and feedback. Client-reported receipt of the three elements of preventive care for the four risk behaviours was collected from a cross-sectional sample of clients who had recently attended the service at baseline (6 months) and follow-up (5 months). Logistic regression models examined change in receipt of preventive care to assess effectiveness.

RESULTS

A total of 860 client surveys were completed (control baseline n = 168; target baseline n = 261; control follow-up n = 164; and target follow-up n = 267). Analyses revealed no significant differential changes in preventive care receipt between the target and control sites from baseline to follow-up, including across the four primary outcomes: assessed for all behaviours (OR = 1.19; 95% CI 0.55, 2.57; p = 0.65); advised for all relevant risk behaviours (OR = 1.18; 95% CI 0.39, 3.61; p = 0.77); referred for any relevant risk behaviour (OR = 0.80; 95% CI 0.40, 1.63; p = 0.55); and complete care (OR = 3.11; 95% CI 0.62, 15.63; p = 0.17). Fidelity of the implementation strategies was limited as one of the four strategies (audit and feedback) was not delivered, components of two strategies (enabling resources and prompts, and client activation material) were not delivered as intended, and one strategy (education and training) was delivered as intended although some components were offered late in the implementation period.

CONCLUSIONS

The implementation support package was ineffective at increasing preventive care delivery. Further investigation is required to determine optimal participatory design methods to develop effective implementation strategies, including those that support delivery of care in community mental health settings within the ongoing context of uncertain environmental challenges.

TRIAL REGISTRATION

Australian and New Zealand Clinical Trials Registry ACTRN12619001379101.

Combining public health evidence, policy experience and communications expertise to inform preventive health: reflections on a novel method of knowledge synthesis

Knowledge synthesis methods help summarize evidence and utilize content expertise to draw out key messages to aid knowledge mobilization and translation. Systems thinking and coproduction can support this by facilitating a multiperspective view and ensuring that knowledge is mobilized and translated in a useful and meaningful way for policy-makers and practitioners. In this paper, we describe the development of a knowledge synthesis approach that utilizes coproduction with policy-makers to combine the findings of a programme of research with policy knowledge to support decision-makers working in chronic disease prevention. The process developed by The Australian Prevention Partnership Centre combined the expertise of research, policy and science communications experts. We reflect on how we used coproduction processes to embed policy-makers as partners in the evidence synthesis process via research-policy dialogues, and embedded science communication into the development and presentation of the findings. This differs from a more common approach of researchers generating evidence for policy with limited input from policy-makers themselves. By collaborating with policy-makers and using coproduction, we can better inform policy-relevant research and generate policy-relevant knowledge. We describe the development of our knowledge synthesis approach using two case studies: the first drawing on a body of work in public health law, and the second on a body of work focused on the first 2000 days of life. We consider how these case studies demonstrate the value of working with policy partners as part of a knowledge synthesis process, and discuss how this process could be adapted and used in future.

Priority setting for non-communicable disease prevention - Co-producing a regulatory agenda informing novel codes of practice in Australia

There are a range of priority setting methods for non-communicable disease (NCDs) prevention. However, existing methods are often designed without detailed consideration of local context and political economy- critical success factors for implementation. In Australia, codes of practice under state government Public Health Acts could be used for NCD prevention. To inform the potential development of codes of practice under Public Health Acts, this study aimed to co-create a priority setting framework that accounts for local context and the prevailing regulatory agenda. A priority setting framework was co-produced by a multidisciplinary technical advisory group consisting of government representatives, public health lawyers and academic experts. It incorporated general prioritisation criteria (evidence, cost-effectiveness, equity, burden of disease) and local contextual criteria (legal compatibility, unmet-needs, political acceptability, structural and technical feasibility, community support). The framework was then applied in practice through surveys and policy dialogue workshops to discuss political economy factors. Policies were limited to nutrition, alcohol and physical activity risk factors. Through the prioritisation process, the most impactful, feasible and acceptable policies for NCD prevention via state government codes of practice were: restrictions on in-store placement of unhealthy products, enhancing data systems and capabilities for health surveillance and implementation monitoring, removal of unhealthy foods and drinks sold and supplied in public institutions, prohibition of marketing of unhealthy foods and drinks on assets controlled by government, and implementation of subsidies or grants to increase fruit and vegetable intake. The process illustrated that explicit consideration of local context, legal compatibility and the political economy had a substantial influence on the prioritised list of actions. The proposed priority setting framework is designed to be flexible and adaptable to varying contexts, can be embedded in government processes or utilised by researchers and practitioners to co-produce a regulatory agenda that is locally relevant.

Systematic Review of Contemporary Theories Used for Co-creation, Co-design and Co-production in Public Health

BACKGROUND

There is a need to systematically identify and summarize the contemporary theories and theoretical frameworks used for co-creation, co-design and co-production in public health research.

METHODS

The reporting of this systematic review follows the Preferred Reporting Items for Systematic Reviews and Meta-Analyses. Given substantial interest in and application of co-creation, co-design and co-production, we searched PubMed, CINAHL, Scopus and APA PsycINFO from 2012 to March-April 2022. A quality assessment and data extraction for theory content was performed.

RESULTS

Of the 3763 unique references identified through the comprehensive search strategy, 10 articles were included in the review: four articles named co-creation, two articles named co-creation and co-design, two articles named co-production and co-design, and two articles named co-design. Empowerment Theory was employed by two articles, whereas other theories (n = 5) or frameworks (n = 3) were employed by one article each. For the quality assessment, eight articles received a strong rating and two articles received a moderate rating.

CONCLUSION

There is little indication of theory applications for the approaches of co-creation, co-design and co-production in public health since 2012, given 10 articles were included in this review. Yet, the theories described in these 10 articles can be useful for developing such co-approaches in future public health research.

Co-designing nutrition interventions with consumers: A scoping review

BACKGROUND

There is little known about nutrition intervention research involving consumer co-design. The aim of this scoping review was to identify and synthesise the existing evidence on the current use and extent of consumer co-design in nutrition interventions.

METHODS

This scoping review is in line with the methodological framework developed by Arksey and O'Malley and refined by the Joanna Briggs Institute using an adapted 2weekSR approach. We searched Medline, EMBASE, PsycInfo, CINAHL and Cochrane. Only studies that included consumers in the co-design and met the 'Collaborate' or 'Empower' levels of the International Association of Public Participation's Public Participation Spectrum were included. Studies were synthesised according to two main concepts: (1) co-design for (2) nutrition interventions.

RESULTS

The initial search yielded 8157 articles, of which 19 studies were included (comprising 29 articles). The studies represented a range of intervention types and participants from seven countries. Sixteen studies were published in the past 5 years. Co-design was most often used for intervention development, and only two studies reported a partnership with consumers across all stages of research. Overall, consumer involvement was not well documented. No preferred co-design framework or approach was reported across the various studies.

CONCLUSIONS

Consumer co-design for nutrition interventions has become more frequent in recent years, but genuine partnerships with consumers across all stages of nutrition intervention research remain uncommon. There is an opportunity to improve the reporting of consumer involvement in co-design and enable equal partnerships with consumers in nutrition research.

Trauma-informed patient and public-engaged research: Development and evaluation of an online training programme

INTRODUCTION

As patients, members of the public, and professional stakeholders engage in co-producing health-related research, an important issue to consider is trauma. Trauma is very common and associated with a wide range of physical and behavioural health conditions. Thus, it may benefit research partnerships to consider its impact on their stakeholders as well as its relevance to the health condition under study. The aims of this article are to describe the development and evaluation of a training programme that applied principles of trauma-informed care (TIC) to patient- and public-engaged research.

METHODS

A research partnership focused on addressing trauma in primary care patients ('myPATH') explicitly incorporated TIC into its formation, governance document and collaborative processes, and developed and evaluated a free 3-credit continuing education online training. The training was presented by 11 partners (5 professionals, 6 patients) and included academic content and lived experiences.

RESULTS

Training participants (N = 46) positively rated achievement of learning objectives and speakers' performance (ranging from 4.39 to 4.74 on a 5-point scale). The most salient themes from open-ended comments were that training was informative (n = 12) and that lived experiences shared by patient partners were impactful (n = 10). Suggestions were primarily technical or logistical.

CONCLUSION

This preliminary evaluation indicates that it is possible to incorporate TIC principles into a research partnership's collaborative processes and training about these topics is well-received. Learning about trauma and TIC may benefit research partnerships that involve patients and public stakeholders studying a wide range of health conditions, potentially improving how stakeholders engage in co-producing research as well as producing research that addresses how trauma relates to their health condition under study.

PATIENT OR PUBLIC CONTRIBUTION

The myPATH Partnership includes 22 individuals with professional and lived experiences related to trauma (https://www.usf.edu/cbcs/mhlp/centers/mypath/); nine partners were engaged due to personal experiences with trauma; other partners are community-based providers and researchers. All partners contributed ideas that led to trauma-informed research strategies and training. Eleven partners (5 professionals, 6 patients) presented the training, and 12 partners (8 professionals, 4 patients) contributed to this article and chose to be named as authors.

Characteristics and Effectiveness of Co-Designed Mental Health Interventions in Primary Care for People Experiencing Homelessness: A Systematic Review

People experiencing homelessness (PEH) face a disproportionately high prevalence of adverse mental health outcomes compared with the non-homeless population and are known to utilize primary healthcare services less frequently while seeking help in emergency care facilities. Given that primary health services are more efficient and cost-saving, services with a focus on mental health that are co-designed with the participation of users can tackle this problem. Hence, we aimed to synthesize the current evidence of such interventions to assess and summarize the characteristics and effectiveness of co-designed primary mental healthcare services geared towards adult PEH. Out of a total of 10,428 identified records, four articles were found to be eligible to be included in this review. Our findings show that co-designed interventions positively impacted PEH's mental health and housing situation or reduced hospital and emergency department admissions and increased primary care utilization. Therefore, co-designed mental health interventions appear a promising way of providing PEH with continued access to primary mental healthcare. However, as co-designed mental health interventions for PEH can improve overall mental health, quality of life, housing, and acute service utilization, more research is needed.