GSTM1 and metabolic syndrome: In premenopausal women, age (P < 0.001), FBG (P = 0.040), Hb (P < 0.001), and Hct (P < 0.001) were associated with the quartiles of ferritin but SBP (P = 0.571), DBP (P = 0.803), BMI (P = 0.240), WM (P = 0.177), TC (P = 0.769), TGs (P = 0.147), HDL-C (P = 0.663), insulin (P = 0.341), MetS (P = 0.258), MetS score (P = 0.195), HOMA-IR (P = 0.164), and HOMA-B (P = 0.435) were not (Table 4).