Comparison 2. Threatened miscarriage: Dydrogesterone versus placebo.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
2.1 Live birth	1	406	Risk Ratio (M‐H, Fixed, 95% CI)	0.98 [0.89, 1.07]
2.2 Miscarriage (defined as delivery before 24 weeks of gestation)	1	406	Risk Ratio (M‐H, Fixed, 95% CI)	0.90 [0.55, 1.47]
2.3 Preterm birth (defined as birth before 37 weeks of gestation)	1	334	Risk Ratio (M‐H, Fixed, 95% CI)	0.87 [0.40, 1.88]
2.4 Stillbirth	1	406	Risk Ratio (M‐H, Fixed, 95% CI)	0.33 [0.01, 8.13]
2.5 Congenital abnormalities	1	406	Risk Ratio (M‐H, Fixed, 95% CI)	0.71 [0.23, 2.21]
2.6 Adverse drug events	1	406	Risk Ratio (M‐H, Fixed, 95% CI)	2.00 [0.18, 21.88]