Compared with the remaining patients, children homozygous/hemizygous for G6PD deficiency had an average 0.687 g/dL (95% CI 0.145–1.229) lower Hb values from day 0 to 7, those with palpable splenomegaly had 0.431 g/dL (95% CI 0.113–0.749) lower Hb and malnourished children had 0.379 g/dL lower Hb levels (95% CI 0.024–0.734). Here, GSTM1 is linked to G6PD deficiency.