Table 2. Accuracy of scoring system for predicting 3-year events including ILD-related death or first acute exacerbation of ILD.
| Variable | C-index |
|---|---|
| CCIS | 0.747 |
| IPF + CCIS + FVC | 0.799 |
| IPF + CCIS + DLco | 0.825 |
| IPF + Age + Sex + CCIS + DLco | 0.792 |
| IPF + Age + Sex + CCIS + FVC | 0.778 |
| IPF + Age + Sex + FVC + DLco | 0.671 |
| IPF + Age + Sex + CCIS + FVC + DLco | 0.788 |
C-indices are reported as the mean value calculated from 100,000 bootstrap samples. CCIS, Charlson Comorbidity Index score; DLco, lung diffusing capacity for carbon monoxide; FVC, forced vital capacity; ILD, interstitial lung disease; IPF, idiopathic pulmonary fibrosis.