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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   576 63.4 28.8 7.8
Gender boys 308 64.6 27.0 8.4
  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
  > 28 weeks 317 87.4 11.7 1.0
Race White 433 62.8 27.7 9.5
  Black 109 68.8 18.7 2.8
  Other 34 52.9 44.1 2.9
Use of antenatal steroids no 153 60.1 31.4 8.5
  0.5 course 83 59.0 28.9 12.1
  1 course 236 66.1 27.5 6.4
  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
  yes 283 47.7 39.9 12.4
Ventilator no 200 87 12.5 0.5
  1 week 174 82.8 15.5 1.7
  >1 – 2 weeks 48 54.2 39.6 6.3
  >2 weeks 154 13.6 61.7 24.7
Use of postnatal steroids no 422 78.7 19.2 2.1
  1 week 47 37.2 61.7 2.1
  > 1 – 2 weeks 38 15.8 52.6 31.6
  > 2 weeks 62 6.5 21.7 48.9
Oxygen for 36 weeks no 474 70.9 23.3 4.9
  yes 102 28.4 50.0 21.6