The univariate analysis revealed that the reticulocyte counts were significantly positively associated with G6PD deficiency (from both assays) (p < 0.001), G6PD ViangchanG871A (p < 0.001), gender (p < 0.001), neonatal anemia (Hb < 15 g/dL) (p < 0.001), ABO incompatibility (p = 0.006), and postpartum age (p < 0.001) (Table 5). This evidence concerns the gene GSTM1 and anemia.