Comparison 3. LMWH versus aspirin.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
3.1 Live birth	1	141	Risk Ratio (M‐H, Fixed, 95% CI)	1.20 [1.00, 1.43]
3.2 Pre‐eclampsia	1	113	Risk Ratio (M‐H, Fixed, 95% CI)	1.93 [0.08, 46.31]
3.3 Adverse events in the mother	1	141	Risk Ratio (M‐H, Fixed, 95% CI)	8.42 [0.47, 149.41]
3.3.1 Bleeding	1	141	Risk Ratio (M‐H, Fixed, 95% CI)	8.42 [0.47, 149.41]
3.4 Venous thromboembolism	1	141	Risk Ratio (M‐H, Fixed, 95% CI)	Not estimable
3.5 Arterial thromboembolism	1	141	Risk Ratio (M‐H, Fixed, 95% CI)	Not estimable
3.6 Preterm delivery of a live infant	1	113	Risk Ratio (M‐H, Fixed, 95% CI)	0.96 [0.17, 5.50]
3.7 Pregnancy loss	1	141	Risk Ratio (M‐H, Fixed, 95% CI)	0.49 [0.25, 0.98]