Mean maternal Hb level was 111.5 g/L; 47 subjects (26%) met the criterion for mild anemia (Hb: 100–110 g/L), 32 subjects (18%) for moderate anemia (Hb: 70–99 g/L), and none (0%) for severe anemia (Hb: < 70 g/L). Here, GSTM1 is linked to anemia (phenotype).