Outcome or subgroup	Studies	Participants	Statistical method	Effect estimate
2.1 Knowledge ‐ Pregnancy prevention	5	1433	Risk Ratio (M‐H, Random, 95% CI)	1.02 [0.87, 1.21]
2.1.1 RCT	2	178	Risk Ratio (M‐H, Random, 95% CI)	1.49 [1.10, 2.03]
2.1.2 Quasi RCT	3	1255	Risk Ratio (M‐H, Random, 95% CI)	0.94 [0.79, 1.12]