GSTM1 and anemia (phenotype): About 93 (24.2%) of them were with mild anemia (Hb level: 10–11 g/dL), 43 (11.2%) had moderate anemia (Hb level: 7–9.9 g/dL), and the rest, 9 (2.3%), were diagnosed with severe anemia (Hb level: ≤7 g/dL).