GSTM1 and anemia (phenotype): As illustrated in Table 3, BW and day-1 HCT levels were associated with small reductions in anemia risk, with respective ORs of 0.999 (95% CI, 0.999–1.000; p < 0.05) and 0.930 (95% CI, 0.868–0.997; p < 0.05), while the GA and day-1 Hb levels were associated with moderate reductions of approximately 20% in anemia risk, having respective ORs of 0.802 (95% CI, 0.668–0.963; p < 0.05) and 0.776 (95% CI, 0.635–0.949; p < 0.05), and the RBC count was associated with more than a 3-fold reduction in anemia risk, having an OR of 0.316 (95% CI, 0.139–0.716; p < 0.05).