A lower risk of anemia and higher Hb concentration was found by univariate analyses among PLBC compared with NLBC and FLBC both in 2013 (34.9% vs. 44.3 and 48.3%; 11.29 g/dL vs. 10.95 g/dL and 10.85 g/dL) and 2016 (35.2% vs. 45.0 and 45.9%; 11.15 g/dL vs. 10.87 g/dL and 10.80 g/dL). The gene discussed is GSTM1; the disease is anemia.