GSTM1 and metabolic syndrome: In men, age (P < 0.001), DBP (P = 0.003), BMI (P < 0.001), WM (P < 0.001), TC (P = 0.003), TGs (P < 0.001), FBG (P < 0.001), insulin (P < 0.001), MetS (P < 0.001), MetS score (P < 0.001), Hb (P < 0.001), Hct (P < 0.001), and HOMA-IR (P < 0.001) were associated with the quartiles of ferritin but SBP (P = 0.574), HDL-C (P = 0.053), HOMA-B (P = 0.152) were not (Table 2).