GSTM1 and diabetes mellitus: The main input variables considered included patient's gender (Gen), patient's age at first dialysis (age), creatinine (Scr), albumin (Alb), urea (BUN), hemoglobin (Hb), serum phosphorus (P), serum potassium (K), heart failure (HF), diabetes (DM), nausea and vomiting (DIG), edema (URI), and uremic encephalopathy (NEU).