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| ROP grade | Conventional screening criteria |
Alex-ROP |
Hg Alex-ROP |
|||
| Risk | No risk | Risk | No risk | Risk | No risk | |
| Type 1 prethreshold ROP | 16 | 0 | 16 | 0 | 16 | 0 |
| Type 2 prethreshold ROP | 24 | 0 | 24 | 0 | 24 | 0 |
| Low grade ROP | 80 | 0 | 80 | 0 | 56 | 24 |
| Absent ROP | 440 | 0 | 329 | 111 | 35 | 405 |
| Total | 560 | 0 | 449 | 111 | 131 | 429 |
ROP: Retinopathy of prematurity; Hg Alex-ROP: High-grade Alex-ROP.
