GSTM1 and anemia: The severity of anaemia was associated with a corresponding increasing risk of mortality, OR death of haemoglobin (Hb) 5–8 g/dL was 3.41 (1.61∶ 7.23) p = 0.001; at Hb<5 g/dL the OR was 6.34 (1.86∶ 21.62) p = 0.003.