Comparison 10. Subgroup analysis: symptomatic participants.

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 Symptoms not stated	5	999	Odds Ratio (M‐H, Random, 95% CI)	0.41 [0.20, 0.83]
1.2 Symptomatic	2	197	Odds Ratio (M‐H, Random, 95% CI)	0.64 [0.32, 1.25]
2 PTSD total symptoms	21		Std. Mean Difference (IV, Random, 95% CI)	Subtotals only
2.1 Symptoms not stated	12	1648	Std. Mean Difference (IV, Random, 95% CI)	‐0.41 [‐0.68, ‐0.13]
2.2 Symptomatic	9	1639	Std. Mean Difference (IV, Random, 95% CI)	‐0.30 [‐0.53, ‐0.06]