GSTM1 and diabetes mellitus: A significant difference was observed in the PFT, HbA1C, UTP, age, urine creatinine, urine microalbumin, UACR, ALB, urea, SCr, UA, TG, LDL, eGFR, Hb, PT, duration of diabetes mellitus, and hypertension levels among the three DM subgroups (P < 0.05) (Table 2).