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%)