GSTM1 and anemia (phenotype): Of 3,170 children in the FEAST trial, 3,082 (97%) had a baseline Hb measurement, and 2,346/3,082 (76%) were anaemic (Table 1); 1,002/3,082 (33%) children had severe anaemia, 501 (16%) moderate anaemia, and 843 (27%) mild anaemia.