The mean Hb level among the 500 patients with baseline anemia was 102.45 ± 11.81 g/l, and most patients with baseline anemia had mild to moderate anemia, including 328 patients (65.6%) with mild anemia and 148 (29.6%) with moderate anemia, compared with only 22 (4.4%) with severe anemia and two (0.4%) with life-threatening anemia. Here, GSTM1 is linked to anemia (phenotype).