Maximum ROP stage | Study group (n = 36) | Control group (n = 80) |
No ROP (n, %) | 0 | 40 (50.0%) |
Stage 1 (n, %) | 0 | 18 (22.5%) |
Stage 2 (n, %) | 14 (38.9%) | 16 (20.0%) |
Stage 3 (n, %) | 22 (61.1%) | 6 (7.5%) |