Appropriate therapies ( 89.7 versus 67.7 ; incidence rate ratio , 0.77 ; 95 % confidence interval , 0.60-0 .97 ; P = 0.029 ) and appropriate shocks ( 37.1 versus 28.1 ; incidence rate ratio , 0.64 ; 95 % confidence interval , 0.45-0 .93 ; P = 0.018 ) were also reduced .