The proportion of children with mild anaemia (Hb = 10–10.9 g/dL) was 18.8%, 100 of 415 children (24.1%) had moderate anaemia (Hb = 7.0–9.9 g/dL) and 6.3% (26 of 415 children) had severe anaemia (Hb < 7.0 g/dL). Here, GSTM1 is linked to anemia (phenotype).