Comparison 3. Sensitivity analysis.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Excluding studies with unclear randomisation methods	2	234	Risk Ratio (M‐H, Random, 95% CI)	1.05 [0.77, 1.44]
2 Excluding studies with unclear allocation concealment methods	2	234	Risk Ratio (M‐H, Random, 95% CI)	1.05 [0.77, 1.44]
3 Exclusion of studies with high risk of bias regarding blinding	8	516	Risk Ratio (M‐H, Random, 95% CI)	1.07 [0.86, 1.34]
4 Exclusion of studies with high risk of bias regarding incomplete outcome data	6	375	Risk Ratio (M‐H, Random, 95% CI)	1.19 [0.92, 1.54]
5 Exclusion of studies with imputed values	8	458	Risk Ratio (M‐H, Random, 95% CI)	1.16 [0.90, 1.50]
6 Fixed effects	9	533	Risk Ratio (M‐H, Fixed, 95% CI)	1.10 [0.88, 1.38]