Demographic and clinical characteristics (n=19)
| Characteristic | Definition | Statistics | Results |
| Gestational age | Weeks | Median (range) | 26.4 (24.0–32.7) |
| Birth weight | Grams | Median (range) | 720 (350–1630) |
| Age at enrolment | Days | Mean (SD) | 24 (10) |
| Gender | Female/male | N | 9/10 |
| Ventilation mode | Mechanical ventilation/CPAP | N | 1/18 |
| Fraction of inspired oxygen | Fraction | Median (range) | 0.28 (0.22–0.40) |
CPAP, continuous positive airway pressure;