GSTM1 and anemia: Mild anemia is defined as Hb concentration of 10.0–10.9 g/dl for pregnant women and 6–59-month children, 11.0–11.4 g/dl for 5–11-year-old children, 11.0–11.9 g/dl for non-pregnant women, 12–14-year-old children, and 11.0–12.9 g/dl for adult men.