In multivariate analysis , PRE was a significant predictor for hospital stay after surgery ( odds ratio , 2.56 ; 95 % confidence interval , 1.23-5 .31 ) , longer hospitalization ( count ratio , 2.10 [ 1.31-3 .35 ] ) , higher excess costs ( cost ratio , 1.30 [ 1.12-1 .53 ] ) , and indirect cost ( cost ratio , 1.58 [ 1.20-2 .08 ] ) after adjusting for patient and anesthesia characteristics .