GSTM1 and anemia (phenotype): The results indicated that 134 patients exhibited anemia: 45 (33.58%) had mild anemia (Hb < 11.5 g\dL), 82 (61.19%) had moderate anemia (Hb < 10 g\dL), and 7 (5.22%) had severe anemia (Hb < 7 g\dL).