GSTM1 and malaria: For all participants enrolled, the lowest absolute Hb concentration was 92 g/L, observed in a 6-year-old G6PD-d boy; he had a Hb concentration of 112 g/L at baseline, the nadir Hb concentration on day 10, no malaria parasites detected by blood smear, and a Hb concentration of 106 g/L by day 28.