The absolute difference was largest for moderate or severe anaemia (Hb < 90 g/L; malaria positives: 51.5%, malaria negatives: 24.6%) and the relative difference was largest for severe anaemia (Hb < 70 g/L; malaria positives: 9.4%, malaria negatives: 2.2%). The gene discussed is GSTM1; the disease is anemia.