TABLE 1.
PARTICIPANT CHARACTERISTICS
| Variable | NETT (n = 1,215) | LHS (n = 5,886) | Total (n = 7,101) |
|---|---|---|---|
| Age | 66.4 ± 6.1 | 48.5 ± 6.8 | 51.6 ± 9.6 |
| Race, % white | 94.9 | 95.8 | 95.6 |
| Sex, % male | 61.4 | 62.9 | 62.6 |
| FEV1, L | 0.68 ± 0.22 | 2.64 ± 0.60 | 2.30 ± 0.92 |
| FVC, L | 2.14 ± 0.72 | 4.20 ± 0.94 | 3.84 ± 1.19 |
| FEV1, % predicted | 23.7 ± 6.5 | 75.1 ± 8.8 | 66.3 ± 21.2 |
| FVC, % predicted | 57.1 ± 14.7 | 96.4 ± 10.7 | 89.7 ± 18.7 |
| Interval between tests, d | 85.7 ± 21.7 | 24.9 ± 17.1 | 35.3 ± 29.1 |
| Difference FEV1, L | 0.007 ± 0.12 | −0.011 ± 0.15 | −0.008 ± 0.14 |
| Absolute difference FEV1, L | 0.089 ± 0.08 | 0.110 ± 0.10 | 0.106 ± 0.10 |
| Difference FEV1, % | 2.54 ± 17.4 | −0.35 ± 5.8 | 0.14 ± 9.0 |
| Absolute difference FEV1, % | 13.33 ± 11.4 | 4.29 ± 3.9 | 5.84 ± 6.8 |
| Difference FVC, L | 0.072 ± 0.42 | −0.023 ± 0.20 | −0.007 ± 0.25 |
| Absolute difference FVC, L | 0.317 ± 0.28 | 0.150 ± 0.13 | 0.178 ± 0.18 |
| Difference FVC, % | 5.48 ± 20.9 | −0.47 ± 4.9 | 0.55 ± 10.0 |
| Absolute difference FVC, % | 15.81 ± 14.8 | 3.65 ± 3.3 | 5.73 ± 8.2 |
Definition of abbreviations: LHS = Lung Health Study; NETT = National Emphysema Treatment Trial.
Results are shown as mean ± SD. Data were not available on one participant from the LHS (n = 5,886).