GSTM1 and malaria: Gender female in comparison to male (11.3 ± 1.5 vs. 11.9 ± 1.7 g/dl, β = −0.193; p < 0.0001) and febrile in comparison to afebrile subjects (11.4 ± 1.6 vs. 11.6 ± 1.6 g/dl, β = −0.029; p = 0.008) had a lower concentration of Hb, but there was no effect of malaria positivity on mean Hb concentration of study participants (Table 1).