Demographic characteristics of infants studied
| Mean (SEM) | Range | |
|---|---|---|
| Study 1: | ||
| Gestation (weeks) | 26.3 (0.9) | 24.3–32.0 |
| Birthweight (g) | 861 (99) | 653–1490 |
| Postnatal age (days) | 39.2 (11.7) | 14–141 |
| Body weight at study (g) | 1301 (225) | 700–3095 |
| Peak inspiratory pressure (cm H2O) | 17.3 (0.6) | 14–21 |
| Ventilator rate (breaths/min) | 9.9 (1.2) | 5–16 |
| FIO2 | 0.31 (0.01) | 0.26–0.37 |
| Study 2: | ||
| Gestation (weeks) | 26.9 (0.9) | 24.3–30.5 |
| Birthweight (g) | 824 (83) | 545–1390 |
| Postnatal age (days) | 62.8 (7.8) | 30–100 |
| Body weight at study (g) | 1667 (123) | 1055–2000 |
| Peak inspiratory pressure (cm H2O) | 17.5 (0.6) | 15–20 |
| Ventilator rate(breaths/min) | 9 5 (1.5) | 5–20 |
| FIO2 | 0.27 (0.01) | 0.24–0.30 |