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| Characteristic | (n = 183) |
|---|---|
| Age, in years, mean ± SD | 54.5 ± 9.2 |
| Gender, n (%) | |
| Female | 105 (57.4) |
| Male | 78 (42.6) |
| Self-reported race, n (%) | |
| White | 138 (75.4) |
| Other | 45 (24.6) |
| Economic class, n (%) | |
| A | 15 (8.2) |
| B | 9 (4.9) |
| C | 125 (63.8) |
| D/E | 34 (18.6) |
| Years of schooling, mean ± SD | 9.6 ± 6.1 |
| Smoking history, in pack-years, mean ± SD | 29 ± 15 |
| COPD, n (%) | 36 (19.7) |
| Symptoms of depression, n (%) | 54 (29.5) |
