“…(31,32) All articles addressed stages 1 and 3 ROP and only one article (22) did not include stage 2 ROP. As to stages 4 and 5, NBs with stage 4 ROP were investigated in ten articles (40%) (16,21,22,24,25,27,30,32,34,38) and NBs with stage 5 ROP in eight articles (32%). (16,21,22,27,30,31,32,38) With regard to the number of eyes analyzed and classified according to ROP severity, 4,698 did not have ROP, 820 had stage 1 disease and 404 had stage 2 disease (68.1%, 11.9% and 5.8% respectively).…”