Relation of ROP to gestational age at birth
| Gestational age at birth (weeks) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | Total | |
| Total | 2 | 9 | 17 | 29 | 30 | 32 | 50 | 65 | 65 | 93 | 392 |
| No ROP (%) | 0 (0) | 0 (0) | 2 (11.8) | 4 (13.8) | 14 (46.7) | 21 (65.6) | 43 (86.0) | 58 (89.2) | 62 (95.4) | 88 (94.6) | 292 |
| Mild ROP (%) | 0 (0) | 2 (22.2) | 2 (11.8) | 12 (41.4) | 10 (33.3) | 8 (25.0) | 5 (10.0) | 6 (9.2) | 2 (3.0) | 5 (5.4) | 52 |
| Severe ROP Not treated (%) | 0 (0) | 0 (0) | 4 (23.5) | 5 (17.2) | 4 (13.3) | 0 (0) | 1 (2.0) | 1 (1.6) | 1 (1.6) | 0 (0) | 16 |
| Severe ROP Treated (%) | 2 (100) | 7 (77.8) | 9 (52.9) | 8 (27.6) | 2 (6.7) | 3 (9.4) | 1 (2.0) | 0 (0) | 0 (0) | 0 (0) | 32 |
| Total ROP (%) | 2 (100) | 9 (100) | 15 (88.2) | 25 (86.2) | 16 (53.3) | 11 (34.4) | 7 (14.0) | 7 (10.8) | 3 (4.6) | 5 (5.4) | |