Table 1 Incidence of Retinopathy of Prematurity (ROP) by patient characteristics.
From: Retinopathy of prematurity and risk factors: a prospective cohort study
|  |  | n | No ROP (%) | ≤ stage 2 ROP (%) | > stage 2 ROP (%) |
|---|---|---|---|---|---|
Total cohort | Â | 576 | 63.4 | 28.8 | 7.8 |
Gender | boys | 308 | 64.6 | 27.0 | 8.4 |
| Â | girls | 268 | 61.9 | 31.0 | 7.1 |
Gestational age | ≤ 25 weeks | 61 | 4.9 | 59.0 | 36.1 |
|  | 26–28 weeks | 198 | 42.9 | 47.0 | 10.1 |
| Â | > 28 weeks | 317 | 87.4 | 11.7 | 1.0 |
Race | White | 433 | 62.8 | 27.7 | 9.5 |
| Â | Black | 109 | 68.8 | 18.7 | 2.8 |
| Â | Other | 34 | 52.9 | 44.1 | 2.9 |
Use of antenatal steroids | no | 153 | 60.1 | 31.4 | 8.5 |
| Â | 0.5 course | 83 | 59.0 | 28.9 | 12.1 |
| Â | 1 course | 236 | 66.1 | 27.5 | 6.4 |
| Â | 2 courses | 51 | 62.8 | 25.5 | 11.8 |
|  | ≥ 3 courses | 53 | 67.9 | 30.2 | 1.9 |
Respiratory distress syndrome | no | 293 | 78.5 | 18.1 | 3.4 |
| Â | yes | 283 | 47.7 | 39.9 | 12.4 |
Ventilator | no | 200 | 87 | 12.5 | 0.5 |
| Â | 1 week | 174 | 82.8 | 15.5 | 1.7 |
|  | >1 – 2 weeks | 48 | 54.2 | 39.6 | 6.3 |
| Â | >2 weeks | 154 | 13.6 | 61.7 | 24.7 |
Use of postnatal steroids | no | 422 | 78.7 | 19.2 | 2.1 |
| Â | 1 week | 47 | 37.2 | 61.7 | 2.1 |
|  | > 1 – 2 weeks | 38 | 15.8 | 52.6 | 31.6 |
| Â | > 2 weeks | 62 | 6.5 | 21.7 | 48.9 |
Oxygen for 36 weeks | no | 474 | 70.9 | 23.3 | 4.9 |
| Â | yes | 102 | 28.4 | 50.0 | 21.6 |