Factors associated with mortality in patients with HP
| Intrinsic factors | Older age |
| Male sex | |
| Genetic predisposition | |
| Exposures | Unidentifiable inciting antigen |
| Duration of exposure to inciting antigen | |
| History of smoking | |
| Physiology | Low FVC |
| Low DLCO | |
| Decline in FVC | |
| Lower BAL lymphocytosis | |
| Radiology | Presence of fibrosis on HRCT |
| Extent of fibrosis on HRCT | |
| UIP pattern on HRCT | |
| Histology | UIP pattern |
| Fibrotic NSIP pattern |
BAL: bronchoalveolar lavage; DLCO: diffusing capacity of the lungs for carbon monoxide; FVC: forced vital capacity; HRCT: high-resolution computed tomography; NSIP: non-specific interstitial pneumonia; UIP: usual interstitial pneumonia.