GSTM1 and anemia: In Models II, after adjusting for confounders, the differences in nutritional status among individuals were lower than those in Models I. Results of the adjusted models showed that YYB increased the Hb levels (β: 1.36, 95% CI: 0.92–1.81) and reduced the anemia rate (OR: 0.63, 95% CI: 0.52–0.75).