Comparison 1. Daily educational text messages vs no messages.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 OC use (continuation) at 6 months	1	683	Risk Ratio (M‐H, Fixed, 95% CI)	1.19 [1.05, 1.35]
2 OC use (continuation) : follow up 187 d or less	1	200	Risk Ratio (M‐H, Fixed, 95% CI)	1.41 [1.13, 1.74]
3 OC use (continuation): follow up 188 d or more	1	483	Risk Ratio (M‐H, Fixed, 95% CI)	1.11 [0.95, 1.29]
4 No OC interruptions > 7 days at 6 months	1	683	Risk Ratio (M‐H, Fixed, 95% CI)	1.22 [1.06, 1.41]
5 Missed no pills in last month	1	683	Risk Ratio (M‐H, Fixed, 95% CI)	1.44 [1.16, 1.79]
6 OC use at last intercourse	1	683	Risk Ratio (M‐H, Fixed, 95% CI)	1.15 [1.03, 1.28]