GSTM1 and anemia (phenotype): We found that 1 in 4 adolescent girls had anemia, similar to the reported 26% anemia prevalence in NPNL (including adolescents) during the Bangladesh National Micronutrient Survey (NMS) 2011–2012 [1] and the global prevalence of anemia (2000-19) [7], but lower than the reported 40% prevalence in the general population during the Bangladesh Demographic and Health Survey conducted in the same year as the NMS 2011-12, which measured Hb using a single drop of capillary blood and a HemoCue 201 [42].