At 36–40 weeks of gestation (before delivery) the prevalence of severe anaemia (Hb<8 g/dl) and moderate (8< = Hb<11 g/dl) anaemia was respectively 1.7% and 45.9% overall and was similar in all treatment groups; similarly asymptomatic parasitaemia was 12.0% in study women overall and was very similar in all treatment groups. This evidence concerns the gene GSTM1 and anemia (phenotype).