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Demographic characteristics of patients with COPD and healthy controls
| Variables | COPD patients | Controls | P-value |
|---|---|---|---|
| Number of subjects (male:female) | 25 (21:4) | 25 (21:4) | |
| Age (years) (mean ± SD) | 69.2±8.1 (58–84) | 68.0±8.0 (57–86) | 0.59 |
| Education (years) (mean ± SD) | 6.7±3.9 | 7.5±5.0 | 0.53 |
| Family history of COPD (%) | 4 | 0 | |
| Disease duration (years) | 7.0±5.7 | 0 | |
| Smokers (%) | 44 | 40 | 0.86 |
Abbreviations: COPD, chronic obstructive pulmonary disease; SD, standard deviation.
