GSTM1 and retinopathy of prematurity: The risk (OR) of ROP development for the neonates with initial Hb 10.5-15.4 g/dL and 15.4-17.3 g/dL in comparison to neonates with initial Hb >17.3 g/dL were OR (95% CI) 3.7 (1.5-8.9), p = 0.003, and OR (95% CI) 2.5 (1.0-6.16), p = 0.047, respectively (Table 3).