GSTM1 and metabolic syndrome: On univariate logistic regression, age > 45 years, alcohol drinking, hypertension, dyslipidemia, BMI ≥ 25 kg/m2, neck circumference > 35 cm, waist circumference > 85 cm, alanine transaminase > 40 U/L, HDL-cholesterol < 40 mg/dL and triglycerides > 150 mg/dL, eGFR, Hb, and positive anti-HCV were factors associated with prediabetes (Table 5).