GSTM1 and anemia: Analysis of the haematological parameters revealed an anaemia distribution according to morphology of 88.8% normocytic, 9.1% microcytic and 2% macrocytic; and according to severity: severe 3% (Hb < 7 g/dL), moderate 25% (Hb 7–9 g/dL), mild 39% (Hb 9–11 g/dL), and of lower intensity 32% (Hb 11 to 12.9 g/dL).