The prevalence of anemia among AN women (Hb: <11 g/dL) was 72.92%; the rates of mild (Hb: 10.0-10.9 g/dL), moderate (Hb: 7.0 to 9.9 g/dL), and severe (Hb: <7.0 g/dL) anemia among AN women were 38.96%, 33.91%, and 0.83% respectively. This evidence concerns the gene GSTM1 and anemia (phenotype).