GSTM1 and hypertensive disorder: For other variables, such as body mass index (BMI), dialysis duration, hypertension, coronary heart disease, congestive heart failure, tobacco use, alcohol consumption, Hb, CRP, vitamin D, parathyrin, ferritin, Kt/V, urea, creatinine, liver enzymes (ALT, AST), total protein, albumin, cholesterol, triglycerides, HDL, and LDL, no statistically significant differences were detected in the univariate analysis.