Anaemia in pregnancy was defined as Hb less than 11 g/dL and further classified as mild, moderate, and severe anaemia with Hb measurement between 10.0 and 10.9 g/dL, 7.0 and 9.9 g/dL and less than 7.0 g/dL respectively. Here, GSTM1 is linked to anemia (phenotype).