GSTM1 and hypertensive disorder: They were CKD stage 1, CKD stage 3a, male gender, education level (elementary to middle school), living in a rural area, sleep duration, alcohol drinking, perceived health status, EQ-5D, perceived stress, comorbidities (ischemic heart disease, HTN, and DM), SBP, DBP, total cholesterol, HDL level, Hb level and FBG after controlling for all potential confounding factors (Model 5).