Characteristics of infants with ROP specified per stage
| n | GA | BW | Screenings | Plus disease (n) | Treated (n) | Type 1 (n) | |
| No ROP | 780 | 29.6 (24.0–34.9) | 1210 (500–2900) | 2 (1–10) | NA | NA | NA |
| ROP 1 | 159 | 28.1 (24.4–32.1) | 1020 (450–2350) | 4 (1–10) | 1 | 0 | 0 |
| ROP 2 | 97 | 26.7 (24.0–31.4) | 898 (520–1530) | 6 (1–17) | 9 | 8 | 8 |
| ROP 3 | 44 | 25.7 (24.0–30.9) | 750 (410–1415) | 10 (2–19) | 26 | 26 | 25 |
| ROP 4 | 2 | 26.0 (25.6–26.4) | 621 (578–665) | 14 (9–19) | 2 | 2 | 2 |
| ROP 5 | 1 | 26.1 | 520 | 27 | 1 | 1 | 1 |
| APROP | 2 | 25.9 (25.1–26.6) | 893 (785–1000) | 7 (5–8) | 2 | 2 | 2 |
Number of screenings shown as median (minimum–maximum range).
APROP, aggressive posterior ROP; BW, birth weight (g); GA, gestational age (weeks); ROP, retinopathy of prematurity.