Demographic characteristics and laboratory presentation of the pregnant women stratified into severe anemia (Hb<7.0g/dl), moderate anemia (Hb = 7.0–9.9g.dl), mild anemia (Hb = 10.0–11.4g/dl) and normal hemoglobin (Hb> = 11.5g/dl). The gene discussed is GSTM1; the disease is anemia (phenotype).