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Health Economics-Informed Social Return on Investment (SROI) analysis of a nature-based social prescribing craft and horticulture programme for mental health and well-being

Whiteley, Holly, Lynch, Mary, Hartfiel, Ned, Cuthbert, Andrew, Beharrell, William and Edwards, Rhiannon Tudor 2025. Health Economics-Informed Social Return on Investment (SROI) analysis of a nature-based social prescribing craft and horticulture programme for mental health and well-being. International Journal of Environmental Research and Public Health 22 (8) , 1184. 10.3390/ijerph22081184

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Abstract

Demand for mental health support has exerted unprecedented pressure on statutory services. Innovative solutions such as Green or Nature-Based Social Prescribing (NBSP) programmes may help address unmet need, improve access to personalised treatment, and support the sustainable delivery of primary services within a prevention model of population health. We piloted an innovative health economics-informed Social Return on Investment (SROI) analysis and forecast of a ‘Making Well’ therapeutic craft and horticulture programme for mental health between October 2021 and March 2022. Quantitative and qualitative outcome data were collected from participants with mild-to-moderate mental health conditions at baseline and nine-weeks follow-up using a range of validated measures, including the Short Warwick–Edinburgh Mental Well-being Scale, ICEpop CAPability measure for Adults (ICECAP-A), General Self-Efficacy Scale (GSES), and a bespoke Client Service Receipt Inventory (CSRI). The acceptability and feasibility of these measures were explored. Results indicate that the Making Well programme generated well-being-related social value in the range of British Pound Sterling (GBP) GBP 3.30 to GBP 4.70 for every GBP 1 invested. Our initial pilot forecast suggests that the programme has the potential to generate GBP 5.40 to GBP 7.70 for every GBP 1 invested as the programme is developed and delivered over a 12-month period. Despite the small sample size and lack of a control group, our results contribute to the evidence-base for the effectiveness and social return on investment of NBSP as a therapeutic intervention for improving health and well-being and provides an example of the use of health economic well-being outcome measures such as ICECAP-A and CSRIs in social value analysis. Combining SROI evaluation and forecast methodologies with validated quantitative outcome measures used in the field of health economics can provide valuable social cost–benefit evidence to decision-makers.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Schools > Medicine
Publisher: MDPI
ISSN: 1660-4601
Date of First Compliant Deposit: 12 August 2025
Date of Acceptance: 28 July 2025
Last Modified: 12 Aug 2025 11:00
URI: https://orca.cardiff.ac.uk/id/eprint/180351

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