Independent risk factors for severe retinopathy of prematurity in infants with a birth weight≤1500 g
| Adjusted OR | 95% CI | P value | |
| Gestational age (weeks)* | 0.812 | 0.726 to 0.910 | <0.001 |
| Birth weight (g)† | 0.998 | 0.997 to 0.999 | <0.001 |
| Small for gestational age | 0.471 | 0.277 to 0.799 | 0.005 |
| Total days on oxygen‡ | 1.025 | 1.019 to 1.031 | <0.001 |
| Late-onset sepsis | 1.423 | 1.016 to 1.994 | 0.04 |
| Frequency of red blood cell transfusions≥twice | 2.384 | 1.389 to 4.092 | 0.002 |
| Relative weight gain at 28 days (grams) | 0.998 | 0.997 to 0.999 | <0.001 |
P<0.05 represents statistical significance.
*OR for every week.
†OR for every 1 g.
‡OR for each day on oxygen.