According to Khan et al. [10], 42.6% of persons had mild anaemia (Hb in the range of 9.5-13 g/dL), whereas 26.1% of patients had severe anaemia (8 g/dL), and a comparable percentage as in our study had moderate anaemia (8-9.5 g/dL). Here, GSTM1 is linked to anemia (phenotype).