GSTM1 and diabetes mellitus: No statistically significant difference regarding age, gender, BMI and glucose concertation was observed between the subjects divided into these subgroups, but a statistically significant difference was observed regarding hypertension, duration of diabetes, hemoglobin concentration (Hb), urea, creatinine, estimated glomerular filtration rate (eGFR), urine protein and urine protein/creatinine ratio (UPCR) between these two groups of diabetic patients (Table 2).