Patients with 2 to 3 prognostic factors ( n = 636 ) had reduced mortality with CABG compared with those who received OMT ( hazard ratio [ HR ] : 0.71 ; 95 % confidence interval [ CI ] : 0.56 to 0.89 ; p = 0.004 ) ; CABG had no such effect in patients with 0 to 1 factor ( HR : 1.08 ; 95 % CI : 0.81 to 1.44 ; p = 0.591 ) .