Aspirin reduced recurrent VTE ( 7.5 % / yr versus 5.1 % / yr ; hazard ratio [ HR ] , 0.68 ; 95 % confidence interval [ CI ] , 0.51-0 .90 ; P = 0.008 ) , including both deep-vein thrombosis ( HR , 0.66 ; 95 % CI , 0.47-0 .92 ; P = 0.01 ) and pulmonary embolism ( HR , 0.66 ; 95 % CI , 0.41-1 .06 ; P = 0.08 ) .