Comparison 4. Incidence of revascularization procedures over all time periods.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
4.1 Heparin vs placebo or untreated control	6	2520	Risk Ratio (M‐H, Fixed, 95% CI)	0.93 [0.76, 1.15]
4.1.1 LMWH	2	1602	Risk Ratio (M‐H, Fixed, 95% CI)	0.26 [0.09, 0.78]
4.1.2 UFH	3	635	Risk Ratio (M‐H, Fixed, 95% CI)	0.98 [0.76, 1.25]
4.1.3 UFH + warfarin	2	283	Risk Ratio (M‐H, Fixed, 95% CI)	1.14 [0.75, 1.74]