Multivariable analysis showed that Coumadin ( Bristol-Myers Squibb , Princeton , NJ ; odds ratio [ OR ] , 1.72 ; 95 % confidence interval [ CI ] , 1.03-2 .87 ; P = .03 ) , higher body mass index ( OR , 1.05 ; 95 % CI , 1.01-1 .09 ; P = .01 ) , and the use of no conduit/material ( OR , 0.12 ; 95 % CI , 0.82-3 .59 ; P < .001 ) were independently associated with wound complications .