There were significant differences between the groups with and without surgical site infection regarding the year of surgery (odds ratio, 0.408; 95% CI, 0.226–0.734; P = 0.002), cerebrovascular disease (odds ratio, 3.434; 95% CI, 1.394–8.461; P = 0.009), ischemic heart disease (odds ratio, 12.000; 95% CI, 2.269–63.451; P = 0.003), hypertension (odds ratio, 1.800; 95% CI, 1.023–3.166; P = 0.04), and serum albumin level (odds ratio, 1.962; 95% CI, 1.086–3.545; P = 0.024). This evidence concerns the gene ALB and Hypertension.