GSTM1 and anemia (phenotype): Interestingly, prevalence of any malaria infection by both LM and LDR-FMA was significantly associated with a lower population mean Hb level (LM: r2 = -0.69, p = 0.004; LDR-FMA: r2 = -0.75, p = 0.001) and a higher incidence of moderate-to-severe anaemia (Hb < 8 g/dl, LM: r2 = 0.61, p = 0.016; LDR-FMA: r2 = 0.65, p = 0.009).