INS and acute kidney injury: There were totally 338(11.0%), 108(15.3%) and 145(26.3%) patients developed AKI postoperatively in No-DM, DM-oral and DM-insulin group respectively (No-DM group vs. DM-oral group, χ2 = 10.071, p = 0.002; No-DM group vs. DM-insulin group, χ2 = 94.042, p<0.001).