Table 1. Demographic & Clinical Characteristics of the Screened Population at Enrollment.
| Characteristic | Number (%) |
| Gender | |
| Male | 616 (52.2) |
| Female | 566 (47.8) |
| Age | |
| Mean | 63±10 |
| >74 | 158 (13.4) |
| 55–74 | 825 (69.9) |
| <55 | 198 (16.8) |
| Race | |
| White | 1048 (88.7) |
| Non-white or Hispanic | 134 (11.3) |
| BMI | |
| Mean | 27.9±5.4 |
| Underweight (<18.5) | 107 (9.1) |
| Normal (18.5–24.9) | 332 (28.1) |
| Overweight (25–30) | 437 (37.0) |
| Obese I, II, III (>30) | 305 (25.8) |
| Tobacco Exposure | |
| Pack-years | |
| Mean | 42±23 |
| <30 | 437 (36.9) |
| 30–50 | 456 (38.5) |
| >50 | 291 (24.5) |
| Current Smoker | 651 (55.0) |
| Second Hand Smoke Exposure | 389 (28.9) |
| Marijuana Use (ever) | 385 (32.8) |
| Occupational Asbestos Exposure | 307 (26.0) |
| 1st Degree Relative with Lung Cancer | 228 (19.3) |
| Persistent Respiratory Symptoms (>3 mths) | |
| Cough | 230 (19.5) |
| Phlegm | 220 (18.6) |
| Dyspnea (modified MRC scale *) | |
| 1 (mild) | 316 (26.7) |
| 2 (moderate) | 99 (8.4) |
| 3 (severe) | 37 (3.1) |
| 4 (very severe) | 28 (2.4) |
*
MMRC dyspnea scale: 1 = dyspnea with mild exertion (hurrying on level ground or walking up a slight hill; 2 = dyspnea on level ground walk slower than people of the same age due to dyspnea, or have to stop for breath when walking at usual pace; 3 = dyspnea after walking about 100 yards or after a few minutes on level ground; 4 = too breathless to leave the house or breathless when dressing.