GSTM1 and diabetes mellitus: Age, gender, race/ethnicity, family PIR, education level, marital status, smoker, alcohol user, history of hypertension, DM, CHD, CHF, heart attack, stroke, hyperlipidemia, BMI, waist circumference, Hb, FBG, HDL-C, TC, TG, ePWV, AIP, HOMA IR, and TyG index had significant difference among the Q1, Q2, Q3, and Q4 groups.