Sensitivity analysis
Because WBC counts were missing in nearly 12% of patient records, we repeated the univariate and multivariate analysis to include only those patients with WBC counts and ASA Class available. While the demographic analysis demonstrated small differences in gender distribution, perforation rate and cardiac risk factors between the cancer and non-cancer patients that were not seen in the larger cohort, odds of wound complications – either in aggregate or individually – did not change in the sensitivity analysis (Supplemental Tables 1 and 2).