Incidence of ROP in the two consecutive groups in 1990 and 2000
| No (%) patients | ||
|---|---|---|
| 1990 | 2000 | |
| Total study group | 260 | 253 |
| ROP stage 1 | 24 (9.2) | 19 (7.5) |
| ROP stage 2 | 29 (11.2) | 27 (10.7) |
| ROP stage 3 | 45 (17.3) | 44 (17.4) |
| ROP stage 4 | 6 (2.3) | 2 (0.8) |
| ROP stage 5 | 1 (0.4) | 0 (0) |
| Total ROP | 105 (40.4) | 92 (36.4) |