GSTM1 and anemia (phenotype): These eight data variables were then used to construct three imputation models with the following covariates: (i) rs1800629, rs3211938, rs334, and rs542998 (model IM1); (ii) Hb levels, mild anemia positivity, malaria parasite positivity, and transect (model IM2), and (iii) all covariates included in previous models (model IM3).