Although 30-day risk with CABG was higher , a net beneficial effect of CABG relative to OMT was observed at > 2 years in patients with 2 to 3 factors ( HR : 0.53 ; 95 % CI : 0.37 to 0.75 ; p < 0.001 ) but not in those with 0 to 1 factor ( HR : 0.88 ; 95 % CI : 0.59 to 1.31 ; p = 0.535 ) .