Comparison 1. Promotion/universal prevention interventions versus control group in preventing mental disorders in adults.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 Diagnosis of mental disorders at 1‐6 months	1	137	Risk Ratio (M‐H, Random, 95% CI)	0.57 [0.28, 1.18]
1.2 Diagnosis of mental disorders at 7‐24 months	1	323	Risk Ratio (M‐H, Random, 95% CI)	0.67 [0.43, 1.05]
1.3 Quality of life at 0‐1 months	4	684	Std. Mean Difference (IV, Random, 95% CI)	‐0.23 [‐0.51, 0.04]
1.4 Quality of life at 7‐24 months	1	222	Mean Difference (IV, Random, 95% CI)	‐7.30 [‐12.28, ‐2.32]
1.5 Depressive symptoms at 0‐1 months	3	349	Std. Mean Difference (IV, Random, 95% CI)	‐0.31 [‐0.78, 0.15]
1.6 Depressive symptoms at 1‐6 months	1	153	Mean Difference (IV, Random, 95% CI)	‐1.25 [‐3.28, 0.78]
1.7 Depressive symptoms at 7‐24 months	2	1207	Std. Mean Difference (IV, Random, 95% CI)	‐0.13 [‐0.24, ‐0.02]
1.8 Anxiety symptoms at 0‐1 months	1	158	Mean Difference (IV, Random, 95% CI)	‐0.14 [‐0.27, ‐0.01]
1.9 Distress/PTSD symptoms at 0‐1 months	4	722	Std. Mean Difference (IV, Random, 95% CI)	‐0.24 [‐0.41, ‐0.08]
1.10 Social outcomes at 0‐1 months	1	158	Mean Difference (IV, Random, 95% CI)	‐0.45 [‐0.82, ‐0.08]