| Controls | AECOPD | CAP | COPD+CAP | |
| Subjects n | 7 | 16 | 15 | 11 |
| Age yrs | 30.86±5.49 | 70.29±10.76 | 69.79±13.08 | 65.4±13.43 |
| Sex M/F n | 4/3 | 14/2 | 10/5 | 9/2 |
| Nonsmokers | 71.4 | 0 | 28.6 | 11.1 |
| Smokers | 28.6 | 35.7 | 28.6 | 11.1 |
| Ex-smokers | 0 | 64.3 | 42.9 | 77.7 |
| FEV1% of predicted values | 33.85±12.7 | 44.37±24.97 | ||
| FVC/FEV1 | 53.78±15.07 | 66.12±26.63 |
Data are presented as mean±sd or %, unless otherwise indicated. AECOPD: acute exacerbation of chronic obstructive pulmonary disease (COPD) Anthonysen type I; CAP: community-acquired pneumonia; M: male; F: female; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity.