Comparison 2. Aspirin versus vitamin K antagonist (2 years).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
2.1 All‐cause mortality	1	440	Risk Ratio (M‐H, Random, 95% CI)	0.50 [0.05, 5.47]
2.2 Symptomatic deep vein thrombosis	1	440	Risk Ratio (M‐H, Random, 95% CI)	0.71 [0.35, 1.44]
2.3 Pulmonary embolism	1	440	Risk Ratio (M‐H, Random, 95% CI)	1.00 [0.25, 3.95]