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Mental health
Original research
Effectiveness and active ingredients of social prescribing interventions targeting mental health: a systematic review
  1. Matthew Cooper1,
  2. Leah Avery1,
  3. Jason Scott2,
  4. Kirsten Ashley1,
  5. Cara Jordan1,
  6. Linda Errington3,
  7. Darren Flynn2
  1. 1School of Health & Life Sciences, Teesside University, Middlesbrough, UK
  2. 2Faculty of Health & Life Sciences, Northumbria University, Newcastle upon Tyne, UK
  3. 3School of Biomedical, Nutritional, and Sport Sciences, Newcastle University, Newcastle Upon Tyne, UK
  1. Correspondence to Professor Darren Flynn; darren.flynn{at}northumbria.ac.uk

Abstract

Objective This study aims to establish the effectiveness and active ingredients of UK-based social prescribing interventions targeting mental health and well-being outcomes.

Design Systematic review adhering to Preferred Reporting Items for Systematic Reviews and Meta-Analysies guidelines and a published protocol.

Data sources Nine databases were systematically searched up to March 2022.

Eligibility criteria Social prescribing interventions in the UK involving adults aged ≥18 years, which reported on mental health outcomes.

Data extraction and synthesis Two reviewers extracted data on study characteristics; outcomes; referral pathways; treatment fidelity strategies; person-centredness; intervention development processes and theory-linked behaviour change techniques (BCTs). Data were narratively synthesised.

Results 52 074 records were retrieved by the search, 13 interventions reported across 17 studies were included in this review (N=5036 participants at post-intervention). Fifteen studies were uncontrolled before-and-after designs, one a randomised controlled trial and one a matched groups design. The most frequently reported referral pathway was the link worker model (n=12), followed by direct referrals from community services (n=3). Participants were predominantly working age adults, and were referred for anxiety, depression, social isolation and loneliness. 16 out of 17 studies reported statistically significant improvements in outcomes (mental health, mental well-being, general health, or quality of life). Strategies to enhance treatment fidelity were suboptimal across studies. Only two studies used a specific theoretical framework. A few studies reported engaging service users in codesign (n=2) or usability and/or feasibility testing (n=4). Overall, 22 BCTs were coded across 13 interventions. The most frequently coded BCTs were social support-unspecified (n=11), credible source (n=7) and social support-practical (n=6).

Conclusions Robust conclusions on the effectiveness of social prescribing for mental health-related outcomes cannot be made. Future research would benefit from comprehensive intervention developmental processes, with reference to appropriate theory, alongside long-term follow-up outcome assessment, using treatment fidelity strategies and a focus on principle of person-centred care.

PROSPERO registration number CRD42020167887.

  • MENTAL HEALTH
  • PUBLIC HEALTH
  • PRIMARY CARE

Data availability statement

All data relevant to the study are included in the article or uploaded as online supplemental information.

http://creativecommons.org/licenses/by-nc/4.0/

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

https://doi-org.ezproxy.u-pec.fr/10.1136/bmjopen-2021-060214

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    Strengths and limitations of this study

    • The methodological approach undertaken identified active ingredients within effective social prescribing interventions as well as the overall impact of the interventions on mental health and well-being outcomes.

    • Heterogeneity of study designs, populations, interventions and outcome measures prevented the conduct of a meta-analysis.

    • Robust conclusions on the effectiveness of social prescribing for mental health-related outcomes cannot be established due to issues with methodological quality.

    Introduction

    Social prescribing is a complex intervention that aims to provide holistic support and care to people living with a range of long-term health problems.1 It is defined by the Social Prescribing Network as ‘a means of enabling general practitioners and other frontline healthcare professionals to refer patients to a link worker’ from which a link worker will coproduce an action plan to address what matters to the individual.2

    National Health Service England included social prescribing as one of the six pillars of a Universal Personalised Care Strategy,3 and have a target to recruit additional link workers to help reach 900 000 individuals by 2023.3 This is despite several systematic reviews reporting that the evidence for the (cost-) effectiveness of social prescribing is mixed, with most studies having important methodological limitations, including absence of comparison groups,4 disparity in follow-up periods,4 absence of clear and focused objectives5 and no statement of underpinning model or theory informing intervention content or components.6

    To determine what works (or does not work) within social prescribing interventions, there is a pressing need to identify ‘active ingredients’ of social prescribing interventions such as mode of delivery, duration, intensity, underpinning theory/model of behavioural change and theory-linked behaviour change techniques (BCTs). Identification of these active ingredients will help to inform the design and evaluation of future social prescribing interventions, including optimisation of existing interventions. Kimberlee7 and Husk et al,8 describe four models of social prescribing (referral pathways): signposting service users to appropriate services or groups; direct referral from primary care to an activity or service; a link worker (based within or externally to primary care) who receives referrals and in turn conducts a needs assessment and refers the service user onto an activity or service; and the latter model with the addition of feedback and a support loop between the link worker and the service user. This has been supported by purposive action, particularly influenced by the language of prescribing in primary care, to enhance the implementation of social prescribing in primary care.9

    Approximately one in six adults in the UK are living with mental health conditions10 and social prescribing has the potential to improve outcomes for this population. Mental health has a devasting impact on individuals, their families and society, with depression and anxiety disorders affecting 16% of the UK population at any one time.10 A conservative estimate of the total costs of mental health in the UK in 2019 was £117.9 billion (approximately 5% of GDP), with 56% and 27% for people aged 15–49 and 50–69, respectively.11

    Previous systematic reviews have evaluated the impact of social prescribing on people living with a range of health needs and long-term conditions, but without specific focus on elucidating the evidence of social prescribing interventions for people living with mental health conditions.4 8 12 We conducted a systematic review to establish the effectiveness, and active ingredients of UK-based social prescribing interventions targeting mental health.

    Methods

    Study design

    This systematic review followed a published protocol (CRD42020167887)13 and adhered to the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines.14 A PRISMA checklist for this review is presented in online supplemental material 1.

    Review criteria

    Included studies were social prescribing interventions (any referral pathway, with or without a link worker based in any setting) involving adults aged ≥18 years that reported on mental health or well-being outcomes. Studies involving adults with physical health comorbidities were included if the study reported on mental health-related or well-being outcomes primarily. Only studies with a primary quantitative study design, published in English and conducted in the UK were eligible for inclusion in the review. The decision to restrict the review to UK-based studies was made to ensure relevance and transferability of the findings to the health and social care setting in the UK. Studies were excluded if there was no referral or signposting to either a link worker or group/service and/or did not report any empirical data.

    Search strategy

    The following nine databases were searched from inception to 21 March 2022: Cochrane Databases of Systematic Reviews (CDSR), The Cochrane Central Register of Controlled Trials (CENTRAL), CINAHL (Cumulative Index of Nursing and Allied Health Literature), Cochrane Protocols, Embase, Medline, PsycINFO, Scopus, and Web of Science. Prior to searching, reviewers carried out an extensive exercise to identify and collate potentially relevant terms to cover the concepts of social prescribing and mental health. The search strategy was then developed by an expert information scientist (LE) and adapted as necessary to consider differing indexing terms and other search functionality available in each of the additional databases.

    The search strategy developed for each database is provided in online supplemental material 2. Reference lists of included studies were searched to identify any further studies to be considered for eligibility of inclusion.

    Study selection

    All results from electronic database searches were uploaded to EndNote V.X9 and underwent a process of deduplication. One reviewer (MC) screened all titles and abstracts and a second reviewer (CJ) independently screened 20% of all titles and abstracts. All studies retained following screening of titles and abstracts were reassessed in full text by the same two reviewers who worked independently using a study selection form. At stage 1 and 2 of study selection, any disagreements between the two reviewers that could not be resolved via discussion were referred to a third reviewer for adjudication (KA or DF). Subsequently, handsearches of reference lists and citation searching of included studies (using Google Scholar) were conducted to identify any potentially relevant literature not captured by the electronic search.

    Data extraction

    A structured data extraction form was used to capture information on study characteristics (country of origin, aims, design, outcomes targeted, inclusion/exclusion criteria, sampling method, sample size, follow-up period, lost to follow-up), components of social prescribing interventions, methodological quality, extent that interventions were person-centred, treatment fidelity strategies, comprehensiveness of intervention development processes and outcome measures. Data were extracted on three stages of social prescribing (where applicable): initial assessment, use of a facilitator or link worker and delivery of socially prescribed activity at a specific service. Components of the Template for Intervention Description and Replication15 checklist were applied to describe key features of social prescribing interventions. One reviewer (MC) extracted data on all included studies and a second reviewer (KA) checked data extracted from 50% of included studies. Any discrepancies between the two reviewers were resolved by discussion and by checking the primary study data.

    Three reviewers (MC, KA and LA) independently coded the presence of theory-linked BCTs within included interventions using the BCT Taxonomy V.1.16 The extent that included interventions adhered to core principles of person-centred care was independently assessed by two reviewers (MC and KA). A four-item checklist was designed specifically for this review, with reference to relevant literature17–19 in order to record whether: a needs assessment was conducted with the study participants (i.e., a tailored conversation to discuss their needs and goals); a choice of social prescribing activity was offered to participants; participants were actively involving in discussion to elicit their preferences for type of social prescribing activity and the participants received a social prescription consistent with their preferred choice of social prescribing activity.

    The comprehensiveness of developmental processes for social prescribing interventions were assessed using a checklist developed in a previous systematic review20 to record: use of a framework, theory or model to guide design and evaluation, use of best available evidence from research (eg, systematic review), conducting a needs assessment with service users, evidence of coproduction or design with service users and evidence of piloting or feasibility testing in the target population.

    Methodological strategies used by included studies to monitor and enhance the reliability and validity of behavioural interventions (ie, treatment fidelity strategies) were assessed independently by three reviewers (MC, KA, and DF) using a framework published by Bellg et al.21 This framework describes treatment fidelity across five domains: design of the study; monitoring and improving provider training; monitoring and improving delivery of interventions; monitoring and improving receipt of interventions; and monitoring and improving enactment of intervention skills.

    Any additional articles, grey literature or media sources that were referenced by included studies were consulted for the purpose of coding intervention development processes, person-centredness, fidelity and BCTs. Where appropriate, data were coded across multiple studies reporting on the same intervention.

    Methodological quality assessment

    Methodological quality was assessed independently by two reviewers (MC and KA) using the Critical Appraisal Skills Programme Randomised Control Trial Checklist,22 National Heart, Lung and Blood Institute Quality Assessment Tool for Before-and-After Studies,23 and ROBINS-I: tool for assessing risk of bias in non-randomised studies of interventions.24

    Data synthesis

    Data were synthesised narratively due to the heterogeneity of study designs, populations, interventions (referral pathways, form and content) and outcome measures (i.e., assessment methods to assess mental health and well-being). The ‘promise’ of active ingredients and other intervention features for positively changing outcomes was assessed by calculating promise ratios.25

    Patient and public involvement

    There was no patient or public involvement in this study.

    Results

    In total 52 074 (database searching n=51 965, reference lists and citation/hand searching n=109) potentially relevant studies were identified from the electronic search (figure 1). A total of 297 full-text articles (database search=288 and citation/handsearching=9) were assessed for inclusion. Seventeen studies reporting on 13 interventions met the inclusion criteria.26–42 An additional 15 sources of grey literature were consulted for details on the intervention development, person-centredness, fidelity and BCTs.43–57

    Figure 1
    Figure 1

    PRISMA diagram. PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-Analyses. *Databases searched. **At title and abstract level. CDSR,cochrane databases of systematic reviews; CENTRAL, the cochrane central register of controlled trials; CINAHL, cumulative index of nursing and allied health literature; Cochrane Protocols, Embase, Medline, PsycInfo, Scopus and Web of Science.

    Findings of the Art Lift intervention were reported across four studies.26–29 The Art Shine intervention was reported in one study.30 The Social Cure and social prescribing intervention was reported across two studies.38 39 The British Red Cross Connecting Communities,31 The Cadwun Mon,32 The Cares of Life Project,33 The Fife Social Prescribing: Mood Café,34 GROW: Art, Park and Well-being,35 Luton Social Prescribing Programme,36 Museums on Prescription,37 The Southwest Well-being Programme,40 and Wetlands for Well-being42 all were reported within one study. One included study41 did not provide a specific name for the intervention.

    Study characteristics

    A summary of the 13 interventions reported across the 17 included studies is presented in table 1. Fifteen studies were conducted in England,26–31 33 35–42 one in Wales32 and one in Scotland.34 Seventeen studies had a combined post-intervention sample size of 5036 participants. Fifteen studies were uncontrolled before-and-after designs,26–32 34–40 42 one a randomised controlled trial33 and one a matched groups design.41

    View this table:
    Table 1

    Summary of study characteristics

    The referral pathways were mapped against those described by Husk et al.8 The most common referral pathway reported within studies was the link worker model (n=12 studies),26–29 31 32 34 36 38 39 41 42 followed by referrals direct from community services (n=3 studies),35 37 40 primary care30 or from multiple services.33

    The mean age of participants who received social prescribing interventions ranged from 43 to 77 years across 11 studies.26–34 38 39 Six studies did not report on the age of participants.35–37 40–42 Two studies did not report data on the sex of participants.33 41 Out of 15 studies that reported on participant sex, 12 studies reported a higher proportion of female participants.26–32 34 36–38 40

    Data on ethnicity of participants were reported in seven studies,30 31 33 37 40–42 but most did not report data using census categories; for example, only reporting numbers of participants who were White British or from Black, Asian and Minority Ethnic (BAME) groups. Only one study specifically targeted people from BAME groups.33 One study did not report on participant ethnicity at the post-assessment period.41 Proportions of White or White British participants at post-assessment based on data from five studies was 58%,31 66%,30 82%37 42 and 91%.40

    Employment status was reported by five studies28–30 36 42 and was summarised into four categories: participants who were in work (either full time or part time), education (full time or part time education or described as a student) or position of responsibility (such as full time carers) (ranged from 1 to 259 participants); those who were not unemployed or incapacitated from work (ranged from 10 to 198 participants based on data from 5 studies); participants who were retired (ranged from 5 to 209 participants based on data from 2 studies); and participants described as ‘other’(ranged from 2 to 21 participants based on data from 2 studies). Employment status was not reported by the remaining 12 studies.26 27 30–35 37–39 41

    The most commonly reported reasons for referral to a social prescribing service were anxiety or depression, (or combined anxiety and depression), n=9 studies.26–29 33 35 40–42 Depression and social isolation was the primary reason for referral in one study.30 Loneliness was the primary reason for referral in one study,31 and social isolation in another.37 Social isolation and loneliness was reported as the primary reasons for referral by three studies.32 38 39 The two remaining studies reporting mild to moderate mental health issues36 and mental well-being35 as primary reasons for referral.

    The period between baseline assessment and follow-up was reported by 15 studies and ranged between 1.5 months40 and 9 months.39 One study did not report a follow-up period.34 One study reported a follow-up period that was based on individual need.36 Fourteen studies reported sample sizes at preassessment, which ranged from n=1642 to n=841.40 All 17 included studies reported the total number of individuals who took part in a follow-up assessment, ranging from 1642 to 2250.31 Based on data from 14 studies,26–29 32–36 38–42 the average lost to follow-up (attrition rate) was 38% (SD=27), which ranged from 90%39 to 0%.35 42

    Study outcomes

    Outcomes are grouped into between-group and within-group differences (table 2). Of the 17 included studies, 16 reported statistically significant improvements in mental health, mental well-being, general health or quality-of-life outcomes from baseline to follow-up26–32 34–40 42 or between the intervention group and matched controls.33 Only one intervention (unnamed intervention)41 did not report any statistically significant improvement in outcomes.

    View this table:
    Table 2

    Between and within group changes in outcomes

    The 7-item or 14-item Warwick- Edinburgh Mental Well-being Scale (WEMWBS)58 was the most frequently used outcome measure.26–30 34 36 40 42 Seven studies used the 14-item26–30 34 42 and three used the 7-item short-form version.26 36 40 All studies reported a statistically significant improvement in mental well-being assessed with the WEMWBS.

    Three studies used other measures of mental well-being: Social Well-being Questionnaire-640; Museum Well-being Measure for Older Adults37 and University College London Museum Well-being Measure.35 All three studies reported a statistically significant improvement in mental well-being.

    Three studies31 38 39 assessed loneliness using the University College London Loneliness Scale-3 or 859 and one32 used the De Jon Gierveld Loneliness Scale.60 All three studies reported a statistically significant reduction in loneliness. One study32 reported a statistically significant reduction in social isolation assessed with the Lubben Social Network Scale .61

    Five studies29 34 40–42 used mental health symptom-based outcome measures such as: Hospital Anxiety and Depression Scale,62 Generalised Anxiety Disorder Assessment-7,63 Patient Health Questionnaire-864 or the Centre for Epidemiological Studies Depression Scale-7.65 Four studies reported a statistically significant improvement in symptom-based outcomes.29 34 40 42

    General health measures were reported by three studies33 40 41: General Health Questionnaire-2866 or Global Assessment of Functioning.67 In addition, quality-of life-measures were used by three studies32 33 39 using the Satisfaction with Life Scale,68 EuroQol Quality of Life Measure69 and the Short-Form-36.70

    Other outcomes assessed by one study42 were stress using the Perceived Stress Scale71 and mood using the Positive and Negative Affect Schedule72 and reported statistically significant improvements in these outcomes following social prescribing.

    Two studies38 41 reported on health service utilisation using patient reported data on group memberships and primary care health service use38 and health records to extract data on consultation rates and medication prescribed.41 Both studies reported a statistically significant reduction in use of primary healthcare.

    Methodological quality assessment

    The methodological quality assessment of for each individual study can be found in online supplemental material 3.

    With reference to the 15 uncontrolled before-and-after studies, the scores (out of 22) ranged from 926 39 to 14.30 36 37 42 All before-and-after studies clearly stated the study question or objective and included participants that were representative of those who would be eligible in the clinical population of interest. Seven studies clearly described the eligibility criteria or described the intervention in sufficient enough detail to ensure the consistent delivery across the included population.28 30 32 36 37 40 42 Only one study detailed sufficient information to conclude that all eligible participants were enrolled26 and one study used a sample size that was adequate to provide confidence in the findings (evidence that the sample size achieved was consistent with a statistical power analysis.38 None of the studies measured outcomes at specified intervals across the study. All but two studies26 38 used outcome measures that had been assessed for reliability and validity. All but two studies26 27 used inferential statistical methods to examine changes in outcomes. There were substantial lost to follow-up of greater than 20% reported in 11 studies.26–29 31 32 34 36 38–40 For four studies, there was insufficient data to calculate a percentage lost to follow-up.30 35 37 42

    The randomised controlled trial33 scored 20 out of a maximum of 22 points. A potential source for bias was performance and ascertainment as the allocation to groups was not concealed from the interventionists, although in the context of social prescribing interventions this is difficult to achieve.

    The matched groups design study41 was found overall to have a moderate level of bias. The bias due to confounding preintervention and selection of participants into the study was judged as being moderate and low, respectively. Bias in classification of interventions was also judged to be low. Bias due to missing, measurement of outcomes and selection of the report results were all judged to be moderate.

    Fidelity assessment

    A summary table presenting the treatment fidelity assessment of the included interventions and sources of information used is presented in online supplemental material 4.

    Design of the study

    All 13 intervention’s provided sufficient information to establish use of treatment fidelity strategies for intervention design to ensure the same dose of the intervention had been delivered within conditions.26–42 None of the intervention’s reported any explicit evidence that they had planned for implementation setbacks (eg, sufficient numbers of link workers being recruited to meet future demand).

    Monitoring and improving provider training

    Seven interventions (Art Shine,30 Cadwyn Mon,31 Cares of Life Project,33 Fife Social Prescribing Mood Café,34 Southwest Well-being Programme,40unnamed intervention41 and Wetlands for Well-being42) provided evidence that they provided standardised training for providers (ie, training was developed specifically for the purpose of intervention delivery). Two interventions (Art Shine30 and Southwest Well-being Programme)40 accommodated and tailored training to address provider differences in delivery (ie, rotations or specific role placement) and targeted acquisition of skills by providers (eg, follow-up sessions with service/research leads). One intervention (Art Shine)30 minimised drift in provider skills over time by monitoring and reviewing delivery on a monthly basis.

    Monitoring and improving delivery of interventions

    Four interventions (Art Lift,26–29 Art Shine,30 Cadwyn Mon,32 GROW: Art. Park and Well-being)35 provided sufficient information to suggest they controlled for provider differences by using strategies such as rotating sessions attended or offering a range of activities. One intervention (GROW: Art. Park and Well-being)35 explicitly reported monitoring adherence to a protocol. One intervention (Art Shine)30 explicitly reported strategies to reduce differences within interventions.

    Monitoring and improving receipt of interventions and enactment of intervention skills

    All 13 interventions reported information regarding service users’ comprehension of the intervention. Due to the nature of social prescribing interventions being tailored to the individual and their specific needs, the specific skills that would be targeted by the interventions is difficult to assess. Similarly, and further due to the absence of long- term follow-up assessments after the intervention period, this prohibited a robust assessment of enactment of intervention skills after the intervention activity had ended.

    Person-centredness

    A summary table of the assessment of person-centredness of the 13 interventions is presented in online supplemental material 5.

    Eight interventions (BRC Connecting Communities,31 Cadwyn Mon,32 Cares of Life Project,33 GROW: Art, Park and Well-being,35 Luton Social Prescribing Programme,36 Social Cure and Social Prescribing,38 39 Southwest Well-being Programme40 and unnamed intervention)41 provided evidence that a personal needs assessment with service users was undertaken to discuss their needs and goals. Six interventions (Art Lift,26–29 Cadwyn Mon,32 Cares of Life Project,33 Fife Social Prescribing: Mood Café,34 GROW: Art, Park and Well-being,35 Luton Social Prescribing Programme,36 Southwest Well-being Programme)40 explicitly stated that service users were offered a choice of social prescribing interventions. Three interventions (Luton Social Prescribing Programme,36 Southwest Well-being Programme40 and Wetlands for Well-being)42 provided explicit evidence that service users were actively involved in discussions to elicit their preferences/values on the available social prescribing options. None of the included interventions provided any explicit evidence they ensured service users received a social prescription that was consistent with their preferences.

    Overall, three interventions (Art Shine,30 Museums on Prescription37 and Wetlands for Well-being)42 did not report any explicit evidence that any core components of person-centred care were adopted. None of the 13 interventions provided any explicit evidence for all four components of person-centred care.

    Intervention development processes

    A summary table of the intervention development processes is presented in online supplemental material 6.

    Eight interventions (Art Lift,26–29 BRC Connecting Communities,31 Cadwyn Mon,32 Cares of Life Project,33 Fife Social Prescribing: Mood Café,34 GROW: Art, Park and Well-being,35 Museums on Prescription,37 and Southwest Well-being Programme)40 provided explicit evidence they had used the best available evidence in the development (eg, systematic reviews, previous research, previous piloting). Eight interventions (Art Lift,26–29 BRC Connecting Communities,31 Cadwyn Mon,32 Cares of Life Project,33 Fife Social Prescribing: Mood Café,34 Luton Social Prescribing Programme,36 Southwest Well-being Programme40 and unnamed intervention)41 explicitly referred to conducting a population needs assessment to inform intervention development. Four interventions (Art Lift,26–29 Art Shine,30 Fife Social Prescribing: Mood Café,34 and Luton Social Prescribing Programme)36 provided explicit evidence of usability testing or feasibility testing/piloting of the intervention; however, one interventions explicitly reported they were in the pilot stage (unnamed intervention).41

    Two interventions provided explicit evidence for the use of a framework to underpin development and evaluation. Cares of Life33 used the Medical Research Council Framework for The Development and Evaluation of Complex Interventions.73 The Social Cure and Social Prescribing38 39 used the Social Cure Framework.74 None of the 13 included interventions provided evidence of the use a theory or model of behaviour change to underpin the development of the intervention. Two interventions (Fife Social Prescribing: Mood Café34 and Southwest Well-being Programme)40 provided evidence of the use of a co-design/production process, working with service users in the codesign of interventions.

    Behaviour change techniques

    A total of 22 different BCTs (figure 2) were reported across the 13 interventions. The most frequently coded BCT was social support-unspecified (eg, social support from link workers, friends or relatives)(n=11), followed by credible source (eg, healthcare professional) (n=7), social support-practical (eg, advise on, arrange or provide practical help) (n=6) and social support-emotional (eg, providing support with feelings and emotions) (n=5).

    Figure 2
    Figure 2

    Frequency of individual BCT’s across included interventions. BCT, behaviour change techniques.

    Individual BCTs were categorised into 10 groupings (figure 3) in accordance with the published taxonomy.16 The most common groupings were social support (n=11); comparison of outcomes (n=7), goals and planning; feedback and monitoring; and natural consequences (all n=6).

    Figure 3
    Figure 3

    Frequency of BCT groupings across the included interventions. BCT, behaviour change technique.

    A promise ratio analysis was planned for the coded BCTs and other intervention features; however, this was not feasible due to the preponderance of positive outcomes (17 of the 18 studies all reported statistically significant improvements in outcomes).

    Discussion

    Summary of findings

    This systematic review identified 13 UK-based social prescribing interventions reported across 17 studies, which most-commonly used a link worker model or direct referral from community services, for predominately working-age adults living with common mental health conditions (anxiety and depression). All but one study reported a statistically significant improvement in outcomes (mental well-being, mental health, loneliness and/or general health/ quality of life outcomes). Consistent with previous research,75–77 two studies38 41 in the current review reported reductions in primary healthcare use (consultation rates and medication prescribed). However, these findings should be interpreted with caution. Consistent with previous reviews of social prescribing interventions,4 8 9 75 the majority (15 out of 17) of the included studies were uncontrolled before-and-after studies (with a range of methodological shortcomings). Attrition rates were generally high (mean of 38%) and there was substantial variability in outcome measures. Furthermore, there was a lack of long-term follow-up studies.

    Person-centredness is one of the key pillars of social prescribing for empowering the person to improve their own health.78 None of the included interventions in this review reported evidence of adhering to all four core principles of person-centred care.

    Ethnicity of participants was under-reported across the studies in the current review. Based on five studies the proportions of White or White British participants ranged from 58%31 to 91%.40 The current Consensus data reports the UK population to be 86% White, 8% Asian, 3% Black and 2% mixed/multiple Ethnic groups.79

    Only two interventions reported using a specific framework for design and evaluation of social prescribing interventions—the Medical Research Council Framework For The Development And Evaluation Of Complex Interventions73 and the Social Cure Framework.74 There was a lack of explicit evidence of service user involvement in codesign activity and usability or feasibility testing of interventions. This could lead to suboptimal acceptability and engagement with social prescribing interventions.

    Treatment fidelity strategies are critically important for external validity of interventions. Evidence from this review indicated several shortcomings in this regard. However, due to the nature of social prescribing interventions (ie, highly tailored to individuals and their circumstances), the findings of the fidelity assessment should be interpreted with caution. There is no published guidance for assessing fidelity of social prescribing interventions. For example, it is not clear what cognitive and behavioural skills social prescribing interventions are targeting and how these can be assessed in terms of receipt and enactment by participants.

    The most common BCT groupings identified were: social support (BCTs—social support-unspecified/ practical/ emotional); comparison of outcomes (BCTs—credible source); goals and planning (BCTs—goal setting (behaviour), problem solving, goal setting (outcome), and action planning); feedback and monitoring (BCTs—feedback on behaviour, self-monitoring of behaviour, monitoring of behaviour by others without feedback, feedback on outcome of behaviour); and natural consequences (BCTs—information about health consequences, information about social and environmental consequences, information about emotional consequences). The importance of identifying and reporting on BCTs used when developing/delivering interventions is important to further understanding and to facilitate replicability.80–82

    Given the lack of detail provided by the studies of social prescribing interventions in the review, and that 16 out of 17 studies reported statistically significant improvements in outcomes, we were unable to conduct promise calculations (summing promising interventions (reported positive results) that includes a specific active ingredient of interest, for example different models of social prescribing, and dividing this by the number of non-promising interventions (reporting negative results or no change) featuring the same active ingredient) to explore further the active ingredients of effective social prescribing interventions.

    Limitations

    Several limitations of this review need to be acknowledged. There continues to be a debate about what constitutes a social prescribing intervention, and this will be reflected in published literature. Therefore, the existence of additional studies that would have met our inclusion criteria cannot be ruled out. Findings of the review are also limited by the descriptions of interventions reported within the included studies (ie, most social prescribing pathways/interventions were not described in detail), which impacts on conclusions about intervention development processes, person-centredness, treatment fidelity and BCTs. Improved quality of reporting on social prescribing models and interventions with reference to a published BCT taxonomy16 would help address this issue.

    Future research

    It is critical that complex interventions are underpinned by a structured development process involving service users and providers in a codesign activity with reference to appropriate evidence and theory. Future research should prioritise the application of theory to the design and evaluation of interventions to help identify the optimal theoretical approach to underpin social prescribing interventions for specific outcomes.

    Future research on social prescribing interventions for mental health (and more broadly) would benefit from systematic evaluation of single and clustered BCTs (alongside improvements in the quality of reporting on intervention descriptions). This would optimise the design and delivery of social prescribing interventions across the entire pathway (eg, from initial contract with a primary care link worker to first appointment with the service providing socially prescribed activities). Interventions could subsequently be tailored for individuals living with mental health conditions to improve person-centred outcomes. Cross-disciplinary reviews have identified the use of BCT clusters including goal planning, feedback and monitoring, social support, and comparison of outcomes, are associated with effectiveness for improving physical activity, mental health seeking behaviour and employee mental health.80–82 In addition, these reviews have highlighted interventions using clusters of BCTs focused on shaping knowledge and comparison of behaviour and have shown improvements in mental health seeking behaviour.81

    Despite variable rates of attrition across the studies included in this review, a few studies reported reasons for service users’ disengaging from social prescribing. This warrants attention and further investigation in future research, as well as a more detailed understanding of why a high proportion of those referred to social prescribing interventions fail to engage. Both emphasise the need to engage service users in the design and evaluation of social prescribing interventions with a focus on principles of person-centred care. In addition, this review has further highlighted the lack of long-term follow-up within social prescribing studies. Future research would benefit from evaluations to establish the long-term impact of social prescribing on service users’ mental health, including specific skills targeted by social prescribing interventions to improve fidelity assessment.

    The narrative synthesis presented in the review is based on data aggregated across the referral pathways adopted by studies. Therefore, future research should conceptualise social prescribing interventions as complex multifacetted interventions. There are different referral pathways for social prescribing, including outside of primary care settings,83 and the specific contact points (eg, initial assessment, interaction with a facilitator or link worker and receipt/ delivery or socially prescribing activity) need to be considered as sperate, but linked facets of a complex multi-faceted intervention involving interactions between healthcare professionals and service users.

    Conclusions

    The predominance of before-and-after studies and associated methodological concerns, suboptimal development processes, and limited evidence of treatment fidelity assessments, prevents any robust conclusions on the effectiveness of social prescribing for mental health-related outcomes. Development of future social prescribing interventions would benefit from comprehensive development processes with reference to appropriate frameworks, theories or models (alongside detailed reporting of social prescribing referral pathways), including long-term outcome assessment and adherence to principles of person-centred care.

    Data availability statement

    All data relevant to the study are included in the article or uploaded as online supplemental information.

    Ethics statements

    Patient consent for publication

    Ethics approval

    Not applicable.

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    Supplementary materials

    Footnotes

    • Twitter @coopermatt7, @healthpsychleah, @drjasonscott

    • Contributors MC and DF conceived the review. DF, LA and JS supervised the review. KA, CJ and JS assisted MC with study selection, and methodological quality assessment. MC, KA, DF and LA conducted data extraction. LE designed the search strategy, ran all searches, and collated search results. MC drafted the initial manuscript. All authors revised the manuscript for important intellectual content and approved the final version. DF is the guatantor of this work.

    • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

    • Competing interests None declared.

    • Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.

    • Provenance and peer review Not commissioned; externally peer reviewed.

    • Supplemental material This content has been supplied by the author(s). It has not been vetted by BMJ Publishing Group Limited (BMJ) and may not have been peer-reviewed. Any opinions or recommendations discussed are solely those of the author(s) and are not endorsed by BMJ. BMJ disclaims all liability and responsibility arising from any reliance placed on the content. Where the content includes any translated material, BMJ does not warrant the accuracy and reliability of the translations (including but not limited to local regulations, clinical guidelines, terminology, drug names and drug dosages), and is not responsible for any error and/or omissions arising from translation and adaptation or otherwise.