Intervention Characteristics and Mechanisms and Their Relationship with the Influence of Social Prescribing: A Systematic Review

Introduction. Social prescribing (SP) is an integrated care program aimed to improve individuals' health and wellbeing. Understanding the influence of SP and determining best practices and processes are challenging due to variability in its delivery, implementation, and intervention characteristics between different studies and countries. This study aimed to identify the intervention characteristics, mechanisms, and outcomes associated with SP research and explore how these factors relate to the influence of SP on health and wellbeing, healthcare utilization, and care experiences. Method. A comprehensive search was conducted in twelve databases, Google Scholar, and reference lists of relevant studies published from January 2010 up to April 2023. Searches were limited to literature written in English or Dutch. We utilized ASReview, an open-source machine learning tool, to conduct title and abstract screening. The methodological quality of the included studies was assessed using the Mixed Methods Appraisal Tool, and the risk of bias was evaluated using the Cochrane RoB2 and the ROBINS-I. We coded all intervention characteristics, mechanisms, and relevant outcomes. Quantitative data were visually presented using Harvest Plots, and qualitative data were narratively summarized. Results and Discussion. In total, 49 papers were included, of which seven qualitative, seventeen quantitative, and 25 mixed method studies. The findings highlight the importance of social-related mechanisms, including loneliness and social connectedness, in contributing to the observed positive influence of SP on mental health and wellbeing. The observed outcomes seem to be influenced by various characteristics, including gender, age, the presence of a link worker, and the use of behavior change techniques. However, we should be cautious when interpreting these results due to limitations in study designs, such as the lack of controlled trials and statistical considerations. Further rigorous research is needed to comprehensively understand the impact and potential benefits of SP.