GSTM1 and anemia: Most of the anemic patients, 79.6%(n = 148), had mild degree of anemia (Hb ≥ 11 g/dl), while 19.3%(n = 36) had moderately severe anemia (Hb 8-10.9 g/dl) and two individuals (1.1%) had severe anemia (Hb < 8 g/dl) (Table 5).