For the multivariate analysis , independent predictors of the ischemia-driven target vessel revascularization were BMS implantation ( odds ratio , 4.95 ; 95 % confidence interval , 2.1-11 .6 ; P < 0.001 ) and vessel size ( odds ratio , 0.32 ; 95 % confidence interval , 0.1-0 .7 ; P = 0.006 ) .