Comparison 1. Educational interventions versus no intervention.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 HIV prevalence	3	14163	Risk Ratio (Random, 95% CI)	1.03 [0.80, 1.32]
1.1 HIV prevalence young women	3	6680	Risk Ratio (Random, 95% CI)	0.96 [0.67, 1.39]
1.2 HIV prevalence young men	3	7483	Risk Ratio (Random, 95% CI)	1.28 [0.71, 2.28]
2 HSV2 prevalence	3	17508	Risk Ratio (Random, 95% CI)	1.04 [0.94, 1.15]
2.1 HSV2 prevalence young women	3	8211	Risk Ratio (Random, 95% CI)	1.05 [0.92, 1.20]
2.2 HSV2 prevalence young men	3	9297	Risk Ratio (Random, 95% CI)	1.02 [0.88, 1.19]
3 Syphilis prevalence	1	6977	Risk Ratio (Random, 95% CI)	0.81 [0.47, 1.39]
3.1 Syphillis prevalence young women	1	2877	Risk Ratio (Random, 95% CI)	0.86 [0.42, 1.76]
3.2 Syphillis prevalence young men	1	4100	Risk Ratio (Random, 95% CI)	0.74 [0.32, 1.72]
4 Pregnancy prevalence (short‐term)	3	8280	Risk Ratio (Random, 95% CI)	0.99 [0.85, 1.16]
5 Pregnancy prevalence (long‐term)	4	12345	Risk Ratio (Random, 95% CI)	0.55 [0.34, 0.91]
6 Self‐reported sexual debut	4	22623	Risk Ratio (Random, 95% CI)	0.96 [0.91, 1.01]
6.1 Young women	3	8126	Risk Ratio (Random, 95% CI)	1.00 [0.94, 1.06]
6.2 Young men	3	8475	Risk Ratio (Random, 95% CI)	0.95 [0.85, 1.06]
6.3 Self‐reported sexual debut young women and young men	1	6022	Risk Ratio (Random, 95% CI)	0.95 [0.82, 1.09]
7 Self‐reported use of condom at first sex	2	8015	Risk Ratio (Random, 95% CI)	1.00 [0.98, 1.01]
7.1 Used condom at first sex young women	2	4365	Risk Ratio (Random, 95% CI)	0.99 [0.97, 1.01]
7.2 Used condom at first sex young men	2	3650	Risk Ratio (Random, 95% CI)	1.00 [0.98, 1.02]
8 Self‐reported use of condom at last sex	6	18795	Risk Ratio (Random, 95% CI)	1.00 [0.97, 1.03]
8.1 Used condom last sex young women	4	7444	Risk Ratio (Random, 95% CI)	1.01 [0.95, 1.07]
8.2 Used condom at last sex young men	4	6412	Risk Ratio (Random, 95% CI)	1.00 [0.93, 1.07]
8.3 Used condom at last sex women and men	2	4939	Risk Ratio (Random, 95% CI)	1.01 [0.91, 1.12]