Table 3.
Demographic Data of the Validation Cohort
| IPF | RA-ILD | P Value* | |
|---|---|---|---|
| N | 63 | 33 | |
| Age, yr (mean ± SD) | 65.4 ± 9.1 | 65.5 ± 11.3 | 0.96 |
| Male, n (%) | 41 (63.1) | 23 (69.7) | 0.52 |
| Ever smoked, n (%) | 43 (66.2) | 21 (63.6) | 0.80 |
| FVC, % predicted (mean ± SD) | 63.3 ± 17.7 | 74.3 ± 23.7 | 0.013 |
| FEV1, % predicted (mean ± SD) | 68.4 ± 18.8 | 73.5 ± 26.2 | 0.35 |
| DlCO, % predicted (mean ± SD) | 42.3 ± 18.1 | 48.5 ± 19.4 | 0.15 |
Definition of abbreviations: DlCO = diffusing capacity of the lung for carbon monoxide; IPF = idiopathic pulmonary fibrosis; RA-ILD = rheumatoid arthritis–associated interstitial lung disease.
*
P value represents the comparison between the IPF and RA-ILD cohort.