Patient characteristics
| Not steroid treated | Steroid treated | Controls | |
| Subjects n | 9 | 14 | 16 |
| Age yrs | 68±4 | 72±2 | 64±4 |
| Sex M:F | 9:9 | 13:1 | 12:4 |
| KCO % pred | 65±10# | 70±5¶ | NA |
| FEV1 % pred | 51±8 | 49±5 | 95±9 |
| Smokers | 0 | 0 | 0 |
| Exsmokers | 9 | 14 | 0 |
| Therapy | |||
| Inhaled β‐adrenergics | 9 | 14 | 0 |
| Theophylline | 0 | 2 | 0 |
| Inhaled steroids | 0 | 14 | 0 |
| Oral steroids | 0 | 0 | 0 |
Data are presented as means±sem
M: male
F: female
KCO: carbon monoxide transfer coefficient
% pred: % predicted
FEV1: forced expiratory volume in one second
NA: not applicable
#: n=5
¶: n=6