In the mild anemia group, Hb content of blood was 95.29 ± 3.74 g/L, 93.76 ± 7.26 g/L, 97.81 ± 7.26 g/L, and 99.90 ± 8.80 g/L before and after one, two, and three months of treatment, respectively. Here, GSTM1 is linked to anemia (phenotype).