Individual progressive fibrosing interstitial lung disease (PF-ILD) criteria met within 24 months of ILD diagnosis
| First PF-ILD criterion met within 24 months of ILD diagnosis | |
| Relative FVC decline ≥10% | 675 (49) |
| Relative FVC decline 5–9% with worsening respiratory symptoms | 166 (12) |
| Relative FVC decline 5–9% with worsening fibrosis on HRCT | 113 (8) |
| Relative FVC decline <5% with both symptom and radiographic progression | 352 (26) |
| Lung transplantation | 9 (1) |
| Death# | 61 (4) |
| Total | 1376 (100) |
Data are presented as n (%). FVC: forced vital capacity; HRCT: high-resolution computed tomography. #: these patients died without meeting any of the other criteria.