Table 1.
Demographics of infants included in the study.
| Characteristics | No ROP (N = 175) | Mild ROP (N = 292) | Type 2 ROP (n = 40) | Type 1 ROP (N = 24) | Total (N = 531) |
|---|---|---|---|---|---|
| Birth weight, grams | |||||
| Mean (SD) | 1257 (265) | 1078 (301) | 912.2 (248.0) | 719.4 (201.8) | 1107 (310) |
| Median (IQR) | 1255 (393) | 1050 (369) | 883 (329) | 656 (231) | 1100 (432) |
| Range | 610–2040 | 510–2600 | 475–1490 | 420–1220 | 420–2600 |
| % <1000 g | 18.9% | 45.5% | 62.5% | 91.7% | 40.1% |
| % ≥1000 g | 81.1% | 54.5% | 37.5% | 8.3% | 59.9% |
|
| |||||
| Gestational age, weeks | |||||
| Mean (SD) | 29 + 6 (2) | 28 + 0 (2) | 27 + 0 (2) | 25 + 0 (2) | 28 + 3 (2) |
| Median (IQR range) | 30 + 0 (2) | 28 + 0 (3) | 27 + 1 (3) | 24 + 5 (3) | 28 + 3 (3) |
| Range | 25 + 2–34 + 3 | 23 + 1–37 + 1 | 23 + 4–31 + 2 | 23 + 0–27 + 5 | 23 + 0–37 + 1 |
| % <28 weeks | 12% | 49.0% | 67.5% | 100% | 40.5% |
| % ≥28 weeks | 88% | 51.0% | 32.5% | 0% | 59.5% |
| Gender (female), no (%) | 78 (44.6%) | 132 (45.2%) | 17 (42.5%) | 6 (33.3%) | 235 (44.3%) |