Characteristics of 125 subjects of the MicroCOPD study
| COPD | Asthma | Control | |
| Subjects | 64 | 3 | 58 |
| Males | 34 (53.1%) | 2 (67.7%) | 34 (58.6%) |
| Current smokers | 15 (23.4%) | 0 | 16 (27.6%) |
| Ex-smokers | 48 (75.0%) | 2 (67.7%) | 35 (60.3%) |
| Never-smokers | 1 (1.6%) | 1 (33.3%) | 7 (12.1%) |
| Smoking exposure pack-years | 28.49±16.08 | 20.88±24.22 | 22.83±18.55 |
| FEV1 % predicted | 56.83±16.30 | 88.31±11.37 | 100.71±11.00 |
| Age years | 68.73±7.23 | 64.41±9.1 | 64.89±8.43 |
| Use of inhaled corticosteroids | 44 (68.8%) | 1 (33.3%) | 1 (1.7%) |
Data are presented as mean±sd unless otherwise stated. COPD: chronic obstructive pulmonary disease; FEV1: forced expiratory volume in 1 s.