Factors associated with mortality between return from operating room and post-operative day 7.

Notes on table: Unadjusted analyses. Survivors form the reference category. †Haldane’s estimator222, 231.Haldane’s estimator is used when cells have a very small or zero value. It calculates the OR as follows: ((TP+0.5)/(FN+0.5))/((FP+0.5)/(TN+0.5)): TP = true positive; FP = false positive. #denotes that there was a 0 in one group.