PPP4C and retinopathy of prematurity: Moreover, the RTG (275.2 [236.3–338.5] pg/mL), ROP (271.8 [257.9–322.2] pg/mL), and PPX (231.7 [207.7–278.8] pg/mL) groups also showed no difference when compared with the noDA (269.8 [204.6–318.6] pg/mL) group (Fig 2 and Table 1).