GPT and diabetes mellitus: There were significant relationships between POPF and these factors according to the univariate analysis: BMI (P = 0.02), Preoperative ALT level (P = 0.04), Prealbumin level before surgery and 1 day after surgery (with P values of 0.001, 0.02, respectively), Drainage on the first day after surgery (P = 0.03), Drainage fluid amylase level on POD1 (P = 0.001), Glucose levels on the morning of the first postoperative day (P = 0.02), History of diabetes mellitus (P = 0.04), ASA score > 2 (P = 0.01).