Primary care and community interventions for multimorbidity involving depression or anxiety: systematic review with meta-analysis

Objective: To identify and characterise primary care or community based interventions for patients with multimorbidity involving depression or anxiety, and to determine their effectiveness for improving patients' mental health, physical health, and quality of life. Design: Systematic review with meta-analysis. Data sources: Medline, Embase, Cochrane Library, CINAHL, PsycInfo, and Web of Science databases, from inception to 11 November 2024. Eligibility criteria for selecting studies: Included studies were randomised controlled trials of primary care or community based interventions targeting adults with depression or anxiety disorders and one or more long term physical conditions. Risk of bias assessment used the Cochrane risk of bias tool. Interventions were categorised as organisational or patient oriented, and were subgrouped by intervention type. Intervention components were systematically categorised, and effects on mental health and quality of life outcomes were meta-analysed in groups defined by intervention type and assessment time point. Physical health outcomes were too heterogenous to meta-analyse and were synthesised without meta-analysis with Fisher's method for combining P values. Results: levels), but not on functional (eg, disability) or global physical health outcomes. Low to moderate quality evidence was found for patient oriented interventions (n=19; interventions including exercise, psychotherapy, and psychoeducation) which led to small improvements in symptoms of depression (standardised mean difference -0.46, 95% CI -0.71 to -0.21) and quality of life (0.22, 0.14 to 0.29) at the end of the intervention. These effects were diminished at the late follow-up period (≥12 months). In the subgroup analysis, no reported data for the long term effects of exercise, psychotherapy, or psychoeducation (18-24 months after randomisation) were found. Synthesis without meta-analysis showed evidence of benefit from patient oriented interventions (primarily psychotherapy) on physiological, functional, and global physical health outcomes. Conclusions: The study showed that interventions improved mental health, physical health, and quality of life outcomes in people with multimorbidity involving depression or anxiety, but the effects were small and, for patient oriented interventions in particular, diminished over time. Systematic review registration: PROSPERO CRD420251004355.