Reductions in the primary endpoint with prasugrel versus clopidogrel ( hazard ratio [ HR ] : 0.79 ; 95 % confidence interval [ CI ] : 0.65 to 0.97 ; p = 0.022 ) were consistent between primary and secondary PCI patients at 15 months ( HR : 0.89 ; 95 % CI : 0.69 to 1.13 vs. HR : 0.65 ; 95 % CI : 0.46 to 0.93 ; p interaction = 0.15 ) .