Mean (SD) lung function parameters before and after treatment
| Standard | NIV assisted | p value | |||
|---|---|---|---|---|---|
| Pre | Post | Pre | Post | ||
| FEV1=forced expiratory volume in 1 second; FVC=forced vital capacity; FER=forced expiratory ratio (FEV1/FVC); FEF25–75=forced expiratory flow rate between 25% and 75% of FVC. | |||||
| p values represent delta standard v delta NIV assisted treatment. | |||||
| FEV1 (l) | 1.35 (0.47) | 1.35 (0.48) | 1.33 (0.42) | 1.35 (0.44) | 0.31 |
| FVC (l) | 2.50 (0.74) | 2.51 (0.98) | 2.53 (0.74) | 2.55 (0.75) | 0.77 |
| FER | 0.54 (0.09) | 0.54 (0.10) | 0.53 (0.10) | 0.54 (0.10) | 0.22 |
| FEF25–75 (l/s) | 0.53 (0.40) | 0.53 (0.42) | 0.52 (0.33) | 0.57 (0.33) | 0.006 |