RESULTS	Time from operation to discharge was reduced from a median of 12 days ( 95 % confidence interval , 9-19 days ) in the placebo group to 10 days ( 95 % confidence interval , 8-12 days ) in the metoprolol group ( adjusted hazard ratio , 1.71 ; 95 % confidence interval , 1.09-2 .66 ; P < .02 ) .\