Table 2. Pulmonary Function Testing and CT Results of Screened Population.
| Pulmonary Function Testing at Enrollment (NHANES) | |
| FVC | 3.72L±1.04 |
| FVC % pred. | 93.0%±16.6 |
| FEV1 | 2.80L±0.83 |
| FEV1% pred. | 90.3±18.5 |
| FEV1/FVC | 75.0±8.4 |
| CT Findings | |
| Emphysema on initial CT scan | 420 (35.5%) |
| Asbestos-related changes(asbestosis, pleural plaques, and/or pleural thickening) | 171 (14.5%) |
| Nodule findings on first or subsequent CTs | |
| No nodule | 557 (47.1%) |
| Any nodule >4 mm | 625 (52.9%) |
| Solid nodules only | 382 (32.4%) |
| Sub-solid nodules only | 104 (8.7%) |
| Both SN and sub-solid>4 mm | 139 (11.6%) |
| Solid Nodules | |
| Total individuals with SNs | 519 (45% of total) |
| Solitary | 266 (51.3% of SNs) |
| Multiple | 253 (48.7% of SNs) |
| Total SNs (not individuals) with f/u scans | 1084 |
| Resolved on f/u | 105 (9.7% of SNs) |
| Mixed pattern | 1 (0.1%) |
| Decreased on f/u | 25 (2.3%) |
| Increased on f/u | 37 (3.4%) |
| Stable on f/u | 916 (84.5%) |
| Sub-Solid Nodules | |
| Total individuals with sub-solid nodules | 239 (20.3% of total) |
| Solitary | 138 (57.9% of SSNs) |
| Multiple | |
| Total sub-solid nodules with f/u scans | 442 |
| Resolved on f/u | 116 (26.2% of SSNs) |
| Mixed pattern | 3 (0.7%) |
| Decreased on f/u | 40 (9.1%) |
| Increased on f/u | 42 (9.5%) |
| Stable on f/u | 241 (54.5%) |
Note: many patients had more than one nodule.
Abbreviations: FVC = forced vital capacity, FEV1 = forced expiratory volume in one second, SSN = Sub-solid nodule; SN = solid nodule; f/u = follow up.