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Demographics in 59 patients with COPD
| Variables | Mean | SD or % total |
|---|---|---|
| Age (years) | 63 | 9 |
| Male | 27 | 46% |
| Caucasian | 47 | 80% |
| BMI | 27 | 6 |
| Pack-years | 41 | 18 |
Abbreviations: BMI, body mass index; pack-years, packs of tobacco smoked per day × years as a smoker; SD, standard deviation.
