Birth weight, gestational age, and incidence of the outcome variables in the two study cohorts
| 1993–1994 | 2001 | p Value | |
|---|---|---|---|
| Unless indicated otherwise, values are mean (SD). | |||
| IV, Intravenous; PO, by mouth; CLD, chronic lung disease. | |||
| Number | 248 | 312 | |
| Birth weight (g) | 1180 (35) | 1160 (20) | 0.575 |
| Birth weight in survivors (g) | 1260 (383) | 1241 (391) | 0.61 |
| Gestational age (weeks) | 28.8 (2.7) | 28.6 (3) | 0.249 |
| Gestational age in survivors (weeks) | 29.3 (2.6) | 29.3 (2.7) | 0.31 |
| Steroid therapy | 54 (22%) | 41 (13%) | 0.007 |
| Dexamethasone (IV) | 54 (22%) | 20 (6%) | |
| Hydrocortisone (IV) | – | 2 (1%) | |
| Betamethasone (PO) | – | 5 (2%) | |
| Budesonide (inhaled) | – | 20 (6%) | |
| Died | 53 (21%) | 46 (15%) | 0.04 |
| CLD in survivors (oxygen at 36 weeks) | 33 (13%) | 51 (17%) | 0.343 |