The results of the univariate logistic regression analysis showed that patients who experienced weight loss before the operation (P=0.021, OR 1.753, 95% [CI] 1.089-2.822) and those with a smoking history (P=0.009, OR 1.715, 95% [CI] 1.142-2.576), alcohol history (P=0.047, OR 1.509, 95% [CI] 1.006-2.264), ACE-27 index of 2-3(P=0.008, OR 2.446, 95% [CI] 1.268-4.721) and diabetes (P=0.047, OR 1.313, 95% [CI] 1.003-1.718) had a significantly higher risk of postoperative complications (Table 1). Here, ACE is linked to diabetes mellitus.