GSTM1 and anemia (phenotype): Furthermore, living in the area of the primary health centre of Kua resulted in a significant increase of 0.90 g/dL in the maternal Hb level [adjusted regression coefficient = 0.90; 95% CI (0.24–1.55)] (Table 4) and a lower odds of anaemia [adjusted OR 0.35; 95% CI (0.14–0.84)] (Table 5).