Table 1. Baseline characteristics.
| Variable | IPF | CTD-ILD | COPD | Controls |
|---|---|---|---|---|
| Cases, n | 8 | 3 | 6 | 6 |
| Male, n | 8*‡ | 0† | 6 | 2 |
| Age (years) | 68.0 | 46.0 | 73.5 | 73.0 |
| Never smoker, n | 0*‡ | 3† | 0* | 6 |
| Lung cancer coexistence, n | 8‡ | 0*† | 6 | 6 |
| KL-6 (U/mL) | 565.5 | 1,313.0 | NA | NA |
| FVC (L) | 3.41 | 2.87 | 3.00 | 2.68 |
| FVC %pred. | 107.1 | 105.5 | 89.5 | 109.7 |
| FEV1/FVC (%) | 78.1† | 86.6 | 57.8* | 77.3 |
| FEV1 (L) | 2.61† | 2.53 | 1.84 | 2.13 |
| DLco %pred. | 85.0 | 95.0 | 86.9 | 105.1 |
Data are presented as median and analyzed by the Kruskal-Wallis test. *, P<0.05 versus Control; †, P<0.05 versus COPD; ‡, P<0.05 versus CTD-ILD. KL-6, Krebs von den Lungen-6; FVC, forced vital capacity; FEV1, forced expiatory volume in 1 second; DLco, diffusing capacity of lung for carbon monoxide; NA, not applicable.