All patients | COPD patients | Non-COPD patients | |||||||
No LTD-NIV | LTD-NIV | p-value | No LTD-NIV | LTD-NIV | p-value | No LTD-NIV | LTD-NIV | p-value | |
Subjects n | 69 | 31 | 34 | 8 | 35 | 23 | |||
FEV1 % pred | 41.4±17.2 | 41.5±15.1 | 0.69 | 39.5±18.8 | 38.0±21.9 | 0.70 | 43.4±15.4 | 42.9±11.5 | 0.65 |
FEV1/FVC % | 60.6±16.0 | 66.6±16.3 | 0.08 | 51.5±13.3 | 52.1±14.7 | 0.95 | 70.3±12.6 | 72.7±12.9 | 0.35 |
SVC % pred | 56.5±18.7 | 54.3±17.1 | 0.74 | 61.7±20.5 | 64.7±19.7 | 0.54 | 50.4±14.6 | 50.5±14.8 | 0.95 |
FVC % pred | 50.7±15.8 | 49.7±15.0 | 0.87 | 53.5±16.6 | 54.5±20.0 | 0.85 | 47.7±14.6 | 47.7±12.5 | 0.96 |
TLC % pred | 75.6±25.9 | 63.1±19.2 | 0.08 | 91.2±23.1 | 83.4±12.1 | 0.58 | 57.4±15.0 | 55.2±15.2 | 0.63 |
RV % pred | 104.1±52.5 | 85.0±41.2 | 0.11 | 134.5±51.4 | 121.9±55.2 | 0.36 | 71.1±28.5 | 69.8±21.4 | 0.95 |
Data are presented as mean±sd or n. COPD: chronic obstructive pulmonary disease; FEV1: forced expiratory volume in one second; % pred: percentage of the predicted value; FVC: forced vital capacity; SVC: slow vital capacity; TLC: total lung capacity; RV: residual volume.