Baseline characteristics
| N=78 | |
| Birth weight (g) | 946 (773–1216) |
| Gestational age (weeks) | 27 (26–29) |
| Age at intubation (hours) | 36 (10–312) |
| Weight when studied (g) | 980 (846–1263) |
| Post-menstrual age (weeks) | 28 (27–30) |
| Male, no (%) | 45 (58) |
| Apgar score at 1 min | 5 (3–7) |
Values are median, intraquartile range (IQR) or number (%).