GSTM1 and anemia (phenotype): One hundred and fifty-one (76.3%) of the children analyzed had moderate anemia (Hb <10>5 g/dL) with Means of BLL=8.6 μg/dL, Hb =7.5 g/dL, FEP/Hb =8.3 μg/g and PD =3.21×103 parasites / μL, while eight (4%) were severely anemic (<5 g/dL).