GSTM1 and anemia (phenotype): Regarding child characteristics, SQ-LNSs had a greater effect among later-born than among first-born children on Hb concentrations (MD: 3.25 g/L compared with 2.28 g/L) (Figure 6A, Supplemental Figure 8A5) and the percentage point reduction in the prevalence of anemia (12 compared with 7 percentage points; P-interaction = 0.024) (Supplemental Figure 8C5), although not on the relative reduction in anemia prevalence (Figure 6B, Supplemental Figure 8B5).