Pulmonary function tests
| Parameter | Value | Patients tested |
| FEV1 mL | 1000±380 | 25 |
| FEV1 % pred | 41±12 | 25 |
| Post-bronchodilator FEV1 mL | 1100±403 | 20 |
| Post-bronchodilator FEV1 % pred | 46±13 | 20 |
| FVC mL | 2119±797 | 25 |
| FVC % pred | 70±20 | 25 |
| FEV1/FVC % | 49±14 | 25 |
| FEF25–75% mL | 518±336 | 19 |
| FEF25–75% % pred | 17±10 | 19 |
| FEF25–75%/FVC % | 16±4 | 19 |
| FEF25% mL | 175±74 | 20 |
| FEF25% % pred | 13±5 | 20 |
| FEF50% mL | 424±256 | 23 |
| FEF50% % pred | 13±6 | 23 |
| FEF75% mL | 1033±783 | 14 |
| FEF75% % pred | 21±14 | 14 |
| RV mL | 2965±1520 | 19 |
| RV % pred | 148±68 | 19 |
| TLC mL | 5280±1750 | 19 |
| TLC % pred | 103±33 | 19 |
| RV/TLC % | 52±13 | 19 |
| RV/TLC % pred | 142±34 | 19 |
| DL,CO mmol·mmHg−1·min−1 | 8.4±5.1 | 14 |
| DL,CO % pred | 78±16 | 14 |
| KCO mmol·mmHg−1·min−1·mL−1 | 2.3±1.2 | 14 |
| KCO % pred | 104±24 | 14 |
| Resting Pa,O2 kPa | 8.8±1.7 | 23 |
Data are expressed as mean±sd or n. FEV1: forced expiratory volume in one second; % pred: % predicted; FVC: forced vital capacity; FEF25–75%: mean forced expiratory flow between 25% and 75% of FVC; FEF25%: forced expiratory flow at 25% of FVC; FEF50%: forced expiratory flow at 50% of FVC; FEF75%: forced expiratory flow at 75% of FVC; RV: residual volume; TLC: total lung capacity; DL,CO: transfer factor for carbon monoxide; KCO: transfer coefficient for carbon monoxide; Pa,O2: arterial oxygen tension. 1 mmHg = 0.133 kPa.