RESULTS	Cardiovascular events occurred in 15 ( 34 % ) and 17 ( 32 % ) patients in the placebo and metoprolol groups , respectively ( unadjusted relative risk , 0.94 ; 95 % confidence interval , 0.53-1 .66 ; adjusted [ for age , sex , statin use , and aortic cross-clamping ] relative risk , 0.87 ; 95 % confidence interval , 0.48-1 .55 ) .\