Compared with medical therapy , mortality was lower for patients randomized to CABG who walked 300 m ( hazard ratio [ HR ] : 0.77 ; 95 % confidence interval [ CI ] : 0.59 to 0.99 ; p = 0.038 ) and those with a PAS > 55 ( HR : 0.79 ; 95 % CI : 0.62 to 1.01 ; p = 0.061 ) .