GSTM1 and diabetes mellitus: When we compare low and high SDNN groups in the clinical and biochemical data, there were no statistical differences in age, hemodialysis duration, BMI, administration of antihypertensives, Hb, albumin, fluid removal, blood pressure and blood pressure change except DM; 29 DM cases (55.1%) in 49 low SDNN patients vs 15 DM cases (36.6%) in 41 high SDNN ones ( p < 0.05).