ROP in relation to gestational age and birth weight
| Gestational age (weeks) | Screened infants (n) | Any ROP (n, %) | Severe ROP (n, %) |
| ≤28 | 1539 | 968 (62.9) | 332 (21.6) |
| 29–32 | 3425 | 666 (19.4) | 76 (2.2) |
| Subtotal (≤32) | 4964 | 1634 (32.9) | 409 (8.2) |
| 33–35 | 1030 | 56 (6.1) | 6 (0.6) |
| >35 | 121 | 5 (4.1) | – |
| Total | 6115 | 1695 (27) | 414 (6.7) |