Comparison 13. Sensitivity analysis: cluster‐randomisation.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 PTSD diagnosis	7		Odds Ratio (M‐H, Random, 95% CI)	Subtotals only
1.1 Cluster‐randomised	4	935	Odds Ratio (M‐H, Random, 95% CI)	0.46 [0.27, 0.76]
1.2 Individuals randomised	3	261	Odds Ratio (M‐H, Random, 95% CI)	0.47 [0.10, 2.19]
2 PTSD total symptoms	20		Std. Mean Difference (IV, Random, 95% CI)	Subtotals only
2.1 Cluster‐randomised	7	2063	Std. Mean Difference (IV, Random, 95% CI)	‐0.40 [‐0.71, ‐0.10]
2.2 Individuals randomised	13	1172	Std. Mean Difference (IV, Random, 95% CI)	‐0.22 [‐0.38, ‐0.06]