Univariate analysis of factors associated with mortality
| Variable | p-value |
| Males | 0.910 |
| Current or ex-smoker | 0.162 |
| Age >56.1 years | 0.139 |
| Absence of systemic autoimmune symptoms | 0.017 |
| Absence of auto-antibody | 0.013 |
| No diagnosis of UCTD# or CTDs | 0.001 |
| Diagnosis of cHP | 0.004 |
| Duration of symptoms >22.5 months | 0.839 |
| Digital clubbing | 0.067 |
| FVC <65.2% predicted | 0.125 |
| DLCO <50.0% predicted | 0.062 |
| Alveolar lymphocytosis >20% | 0.019 |
| Alveolar neutrophilia >5% | 0.090 |
| No response to therapy | <0.0001 |
UCTD: undifferentiated connective tissue disease; CTDs: connective tissue diseases; cHP: chronic hypersensitivity pneumonitis; FVC: forced vital capacity; DLCO: diffusing capacity of the lung for carbon monoxide. #: UCTD as defined by Kinder's criteria [5].