Comparison 7. Sensitivity analysis—excluding studies that might generate high heterogeneity (I² > 75%).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
7.1 Diagnosis of mental disorders at 0‐1 months—indicated prevention adults	2	339	Risk Ratio (M‐H, Random, 95% CI)	0.13 [0.05, 0.33]
7.2 Quality of life at 0‐1 months—selective prevention adults	2	205	Std. Mean Difference (IV, Random, 95% CI)	‐0.66 [‐1.26, ‐0.06]
7.3 Quality of life at 1‐6 months—selective prevention adults	3	634	Std. Mean Difference (IV, Random, 95% CI)	‐0.43 [‐0.92, 0.05]