ALB and infection: According to the univariate analysis, advanced age (> 71 years old), low BMI index (< 23.02 kg/m2), low albumin level before operation (< 3.64 g/dL), lung disease comorbidity, history of hypnotic drug use, prolonged operative time (> 190 minutes), major liver resection (≥ 3 segments), postoperative hemoglobin level, and postoperative infection complications were factors associated with the development of postoperative delirium (Table 4).