Comparison 1. Aspirin versus vitamin K antagonist (6 months).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 All‐cause mortality	1	440	Risk Ratio (M‐H, Random, 95% CI)	3.00 [0.12, 73.24]
1.2 Symptomatic deep vein thrombosis	1	440	Risk Ratio (M‐H, Random, 95% CI)	0.57 [0.24, 1.33]
1.3 Pulmonary embolism	1	440	Risk Ratio (M‐H, Random, 95% CI)	1.00 [0.25, 3.95]
1.4 Major bleeding	1	440	Risk Ratio (M‐H, Random, 95% CI)	7.00 [0.36, 134.72]
1.5 Minor bleeding	1	440	Risk Ratio (M‐H, Random, 95% CI)	6.00 [0.73, 49.43]