The prevalence of anemia among PN women (Hb: <12 g/dL) was 91.36%; the levels of mild (Hb: 10.0-11.9 g/dL), moderate (Hb: 8.0-10.9 g/dL), and severe (Hb: <8.0 g/dL) anemia among PN women were 26.13%, 63.93%, and 1.29% respectively. This evidence concerns the gene GSTM1 and anemia.