GSTM1 and anemia: Additionally, one Korean respective cohort study by Yi et al. [27] verified both preconception mild anemia (100 ≤ Hb < 120 g/L)/moderate-to-serve anemia (Hb < 100 g/L) were associated with an increase of 21%/81% risk of LBW, and 15%/71% risk of SGA, respectively.