52.5% had depleted iron stores, of them 21.7% had iron deficiency anemia (serum ferritin < 15 ng/ml, Hb < 11 g/dl), and 30.8% had iron deficiency without anemia (serum ferritin < 15 ng/ml, Hb ≥ 11 g/dl). This evidence concerns the gene GSTM1 and anemia (phenotype).