Severity and treatment modalities of ROP in treated patients
| Severity of ROP | Only IVB | Only laser treatment | IVB and laser treatment | Total N, (%) |
| APROP | 45 | 26 | 15 | 86 (20.8%) |
| Type 1 ROP | 93 | 145 | 24 | 262 (63.3%) |
| Zone I, any stage of ROP with plus | 28 | 9 | 7 | 44 |
| Zone I, stage 3 without plus | 6 | 2 | 2 | 10 |
| Zone II, stage 2 or 3 with plus | 59 | 134 | 15 | 208 |
| Type 2 ROP | 20 | 24 | - | 44 (10.6%) |
| Zone I, stage 1 or 2 without plus | 4 | 5 | - | 9 |
| Zone II, stage 3 without plus | 16 | 19 | - | 35 |
| Unclassified | 6 | 15 | 1 | 22 (5.3%) |
| Zone II, stage 1 with plus | 4 | 5 | - | 9 |
| Zone III, stage 2 with plus | 1 | 6 | 1 | 8 |
| Zone III, stage 3 with plus | 1 | 4 | - | 5 |
| Total N, (%) | 164 (39.6%) | 210 (50.7%) | 40 (9.7%) | 414 (100%) |
APROP, aggressive posterior retinopathy of prematurity; IVB, intravitreal bevacizumab; N, number of patients; ROP, retinopathy of prematurity.