| Newborns without ROP (n = 22 906 005) | Newborns with ROP (n = 28 011) | |
| Gender (% male) | 48.75% | 49.61% |
| Race | ||
| White | 41.8% | 31.5% |
| Black | 10.3% | 24.8% |
| Hispanic | 14.3% | 15.4% |
| Asian | 3.0% | 2.4% |
| Other race | 3.9% | 4.0% |
| Unknown race | 26.7% | 21.9% |
| Teaching hospital | 44.8% | 77.5% |
| Hospital bedsize, small | 11.4% | 5.4% |
| Hospital bedsize, medium | 28.7% | 21.0% |
| Hospital bedsize, large | 59.8% | 73.6% |
| Birth weight, grams | ||
| <500 | 1.39% | 1.6% |
| 500–749 | 2.42% | 21.0% |
| 750–999 | 2.49% | 31.4% |
| 1000–1249 | 2.93% | 22.4% |
| 1250–1499 | 3.82% | 12.6% |
| 1500–1749 | 5.52% | 6.3% |
| 1750–1999 | 8.78% | 2.6% |
| 2000–2499 | 34.16% | 1.6% |
| >2500 | 38.49% | 0.5% |
| Inpatient mortality | 0.28% | 0.54% |
| LOS, mean, days | 2.7 (SD 12.3) | 67.2 (SD 69.2) |
| Total charges, US$ | 3503.52 (SD 42 993.98) | 192 664.96 (SD 346 642.23) |
LOS, length of stay; ROP, retinopathy of prematurity.