GSTM1 and anemia (phenotype): Mild anemia (Hb: 10.0-10.9 g/dL) was observed in 41 (19.1%), moderate anemia (Hb: 7.0-9.9 g/dL) in 30 (14.0%), and severe anemia (Hb: <7.0 g/dL) in 10 (4.7%) participants.