Expiratory breathing characteristics calculated from flow data from a mechanical ventilator during the first 48 h of life in 33 extremely premature infants with or without later development of moderate/severe bronchopulmonary dysplasia (BPD)
| Preterm-born neonates later developing no/mild BPD | Preterm-born neonates later developing moderate/severe BPD | p-value# | |
| Subjects n | 15 | 18 | |
| PTEF per kg mL·s−1 | 27.6 (22.1–33.2) | 30.2 (25.7–34.7) | 0.45 |
| tPTEF/tE | 21.1 (15.7–26.5) | 23.4 (19.8–26.9) | 0.44 |
| TEF50/PTEF % | 71.8 (62.9–80.6) | 85.1 (81.8–88.4) | 0.007 |
| TEF75/PTEF % | 44.1 (33.7–54.5) | 51.3 (44.2–58.5) | 0.22 |
| FVg | 0.42 (0.39–0.44) | 0.44 (0.42–0.45) | 0.12 |
Data are presented as mean (95% CI), unless otherwise stated. tPTEF: time to peak tidal expiratory flow; tE: expiratory time; TEFn: tidal expiratory flow at n% of expired volume; PTEF: peak tidal expiratory flow; FVg: flow volume gravity. #: independent samples t-test.