Table 1.
Participant Characteristics
| Age, y, mean (SD) | 60.1 (11.9) |
|---|---|
| BMI, kg/m2, mean (SD) | 28.5 (5.4) |
| Pack-years, mean (SD) | 8.1 (14.5) |
| Pack-years among former smokers, mean (SD) | 17.0 (17.1) |
| Median census tract owner-occupied home value, $, mean (SD) | 225,000 (113,000) |
| Population density of census tract, persons/km2, mean (SD) | 1,051 (3,024) |
| Lung volume, L, mean (SD) | 4.9 (1.2) |
| Lung mass, g, mean (SD) | 849 (166) |
| Median lung density, Hounsfield units, mean (SD) | −864 (41) |
| Airway lumen diameter, mm, mean (SD) | 4.8 (0.9) |
| Airway wall area, %, mean (SD) | 53.9 (5.6) |
| Presence of visual emphysema, % | 11 |
| Male, % | 49 |
| Smoker in household in adulthood, % | 23 |
| Smoking status, % | |
| Never | 52 |
| Former | 48 |
| Education, % | |
| <High school | 1 |
| High school | 20 |
| Some college | 30 |
| College graduate | 48 |
Data calculated from 2,545 non-smoking participants enrolled in the chest computed tomography (CT) sub-study. Of these, 2,353 provided CT measures of lung volume, mass, and density, 2,013 had measures of the airway lumen diameter and wall area, and 2,430 had a determination of visual emphysema.