In SSI group, the infection rate was 2.96 % (143/4837) in the albumin <3.5 g/dL group and 1.00 % (1070/106,641) in the albumin >3.5 g/dL group, (RR = 2.39, 95 % CI [1.57 3.64], which was statistically significant (Z = 4.06, p < 0.0001) in a random model (I2 = 68 %). The gene discussed is ALB; the disease is infection.