The 5-year cumulative primary outcome event rate was not significantly different between the groups ( 2.77 % [ 95 % CI , 2.40 % -3.20 % ] for aspirin vs 2.96 % [ 95 % CI , 2.58 % -3.40 % ] for no aspirin ; hazard ratio [ HR ] , 0.94 [ 95 % CI , 0.77-1 .15 ] ; P = .54 ) .