GSTM1 and diabetes mellitus: There were significant differences in the means of hemoglobin (Hb), nPCR, serum albumin, creatinine (Cr), corrected calcium, phosphate, iPTH, hsCRP, total cholesterol, triglyceride and low density lipoprotein and ages; and frequency of DM, hepatitis C infection (HCV), fistula as blood access, and residual daily urine >100 ml.