Comparison 28.

Time elapsed since intercourse in levonorgestrel

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 ≤ 24 h vs > 24‐48 h	4	2336	Risk Ratio (M‐H, Fixed, 95% CI)	0.93 [0.50, 1.73]
2 ≤ 24 h vs > 48‐72 h	3	1646	Risk Ratio (M‐H, Fixed, 95% CI)	0.60 [0.31, 1.19]
3 > 24‐48 h vs > 48‐72 h	3	1551	Risk Ratio (M‐H, Fixed, 95% CI)	0.54 [0.27, 1.11]
4 < 72 h vs > 72 h	4	7453	Risk Ratio (M‐H, Fixed, 95% CI)	0.51 [0.31, 0.84]