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Relation of ROP to birth weight
| Birth weight (g) | |||||
| ≤750 | 751–1000 | 1001–1500 | >1500 | Total | |
| Total | 23 | 67 | 154 | 148 | 392 |
| No ROP (%) | 2 (8.7) | 23 (34.3) | 127 (82.5) | 140 (94.6) | 292 |
| Mild ROP (%) | 4 (17.4) | 22 (32.9) | 20 (13.0) | 6 (4.0) | 52 |
| Severe ROP Not treated (%) | 1 (4.3) | 10 (14.9) | 4 (2.6) | 1 (0.7) | 16 |
| Severe ROP Treated (%) | 16 (69.6) | 12 (17.9) | 3 (1.9) | 1 (0.7) | 32 |
| Total ROP (%) | 21 (91.3) | 44 (65.7) | 27 (17.5) | 8 (5.4) | |
