Although these effects are smaller than what was reported in the 2019 Cochrane systematic review and meta-analysis of LNSs (SQ- or MQ-LNSs) for Hb (MD: 5.78 g/L; 95% CI: 2.27, 9.30 g/L) and anemia (RR: 0.79; 95% CI: 0.69, 0.90) (7), our meta-analysis includes a larger number of trials and individual participants (n = 13 trials and 15,562 participants) than the Das et al. meta-analysis (n = 4–5 trials and 2332–4518 participants), which increases the precision of the effect estimates. Here, GSTM1 is linked to anemia (phenotype).