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Incidence of ROP, mean gestational age at birth (weeks), and mean birth weight (g)
| No (%) | Mean gestational age (weeks) (range) | Mean birth weight (g) (range) | |
| No ROP | 292 (74.5) | 30.3 (25–32) | 1516 (616–2705) |
| ROP 1 | 22 (5.6) | 28.1 (24–32) | 1136 (734–1750) |
| ROP 2 | 30 (7.7) | 27.7 (24–32) | 1075 (634–1885) |
| ROP 3 | 46 (11.7) | 25.9 (23–31) | 876 (591–1640) |
| ROP 4 | 2 (0.5) | 24.5 (24–25) | 544 (462–626) |
| ROP 5 | 0 |
