GSTM1 and anemia (phenotype): The majority of transfusions, 55% (1,490), were received by children with severe anaemia, 29% (789) were received by children admitted with moderate anaemia (Hb 5.0-9.3 g/dl) and 14% (375) received by children who had mild or no anaemia (Hb >9.3 g/dl) at admission.