Univariate and Multivariate Models of Risk Factors for 30-Day All-Cause Hospital Readmission by Surgery.

Abbreviations: ASA, American Society of Anesthesiologists; CI, confidence interval; DVT, deep venous thrombosis; GERD, gastroesophageal reflux disease; OR, odds ratio; PE, pulmonary embolism. Ref denotes the reference group of a categorical variable. The variables for participation of surgical resident, COE volume, abdominal hernia, abdominal pannus, back pain, bipolar disorder, congestive heart failure, fibromyalgia, gout/hyperuricemia, hypertension, lipids, liver disease, musculoskeletal disease, obesity hypoventilation syndrome, panic disorder, personality disorder, psychosis, pulmonary hypertension, substance abuse, stress urinary incontinence, and type-2 diabetes were not significant at P≤.10 in univariate analysis and/or not significant in either multivariate model for either surgery and are not shown. Dashes indicate that the variable was not included in the multivariate model because it was removed either for not meeting the significance threshold in the univariate model or for being removed in the backwards selection procedure.