Univariate analysis showed that being female (P = 0.005), age ≥ 50 years old (P = 0.014), preoperative albumin ≤ 30 g/L (P = 0.041), operative duration ≥ 400 min (P = 0.004), intraoperative blood loss ≥ 3000 ml (P = 0.004), postoperative ventilator support (P = 0.027) were correlated with the occurrence of bacterial infection (Table 6). This evidence concerns the gene ALB and bacterial infectious disease.