Zone and stage of ROP, mean GA, mean BW of patients with ROP
| ROP type | Eye (n) | Eyes (%) | GA (weeks, mean±SD) | BW (g, mean±SD) |
| Zone I stage 1+ | 4 | 8.3% | 28.3±2.1 | 1300.0±230.0 |
| Zone I stage 2+ | 2 | 4.2% | 31 | 1470 |
| Zone I stage 3+ | 3 | 6.2% | 27.7±1.3 | 1146.0±127.0 |
| Zone II stage 2+ | 10 | 20.9% | 29.3±0.8 | 1328.0±248.7 |
| Zone II stage 3+ | 25 | 52.1% | 28.0±1.7 | 1099.0±236.5 |
| AP-ROP | 4 | 8.3% | 28.5±0.6 | 1025.0±144.0 |
| Plus disease | 48 | 100% | 28.5±1.6 | 1209.6±228.6 |
AP-ROP, aggressive posterior retinopathy of prematurity; BW, birth weight; GA, gestational age; ROP, retinopathy of prematurity