Particularly among Taiwanese HC men and women, ORs for MetS were 3.17 (2.75–3.67, p < 0.0001) for Hb ≥ 16.5 g/dL and 3.11 (2.78–3.47, p < 0.0001) for Hb ≥ 14.5 g/dL, respectively. This evidence concerns the gene GSTM1 and metabolic syndrome.