GSTM1 and anemia: No relevant differences between groups were found for anemia (Hb < 12.0 g/dL), marginal iron stores (adjusted FER ≥ 15 and < 50 μg/L), tissue iron deficiency (sTfR > 8.3 mg/L), VitA deficiencies (RBP < 0.70 μmol/L and RBP ≥ 0.70 and < 1.05 μmol/L), VitB12 deficiencies (VitB12 < 148 pmol/L and VitB12 ≥ 148 and < 222 pmol/L) and subclinical inflammation (CRP > 5.0 mg/L and/or AGP > 1.0 g/L).