Results from the 2006 IPTi household survey carried out in July and August, and including all 24 divisions, indicated that prevalence of mild anaemia (Hb < 11 g/dL) was 8% lower (p = 0.02) in children from IPTi intervention areas, while in children who had received IPTi, mean haemoglobin was 0.27 grams higher (p = 0.05) than in children who had received the corresponding EPI vaccine [22]. Here, GSTM1 is linked to anemia (phenotype).