At a mean follow-up time of 4.0 ( SD , 1.7 ) years , the primary outcome event rates were not significantly different between the CCTA and the control groups ( 6.2 % [ 28 events ] vs 7.6 % [ 34 events ] ; hazard ratio , 0.80 [ 95 % CI , 0.49-1 .32 ] ; P = .38 ) .