GSTM1 and anemia (phenotype): We observed a greater effect of SQ-LNSs on Hb concentrations among high anemia burden countries than among countries with a moderate burden of anemia (MD: 4.88 g/L compared with 2.49 g/L) (Figure 4A, Supplemental Figure 6A2), although the effect of SQ-LNSs on anemia prevalence was lower in high anemia burden countries than in moderate anemia burden countries (PR: 0.83 compared with 0.75) (Figure 4B, Supplemental Figure 6B2).