Comparison 5. Subgroup analysis, timing.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
5.1 Live birth/ongoing pregnancy	3	340	Odds Ratio (M‐H, Fixed, 95% CI)	1.11 [0.73, 1.70]
5.1.1 1 to 24 hours	2	280	Odds Ratio (M‐H, Fixed, 95% CI)	1.44 [0.90, 2.30]
5.1.2 ≥ 1 day	1	60	Odds Ratio (M‐H, Fixed, 95% CI)	0.30 [0.10, 0.92]
5.2 Miscarriage	4	430	Odds Ratio (M‐H, Fixed, 95% CI)	0.89 [0.44, 1.78]
5.2.1 ≥ 1 day	2	150	Odds Ratio (M‐H, Fixed, 95% CI)	4.42 [0.91, 21.46]
5.2.2 1 to 24 hours	2	280	Odds Ratio (M‐H, Fixed, 95% CI)	0.47 [0.20, 1.14]
5.3 Clinical Pregnancy	5	526	Odds Ratio (M‐H, Fixed, 95% CI)	1.13 [0.80, 1.61]
5.3.1 ≥ 1 day	2	150	Odds Ratio (M‐H, Fixed, 95% CI)	1.00 [0.53, 1.90]
5.3.2 1 to 24 hours	3	376	Odds Ratio (M‐H, Fixed, 95% CI)	1.19 [0.79, 1.81]