Predictors of hypersensitivity pneumonitis
| Variable | OR (95% CI) |
| Exposure to a known offending antigen | 38.8 (11.6–129.6) |
| Positive precipitating antibodies | 5.3 (2.7–10.4) |
| Recurrent episodes of symptoms | 3.3 (1.5–7.5) |
| Inspiratory crackles | 4.5 (1.8–11.7) |
| Symptoms 4–8 h after exposure | 7.2 (1.8–28.6) |
| Weight loss | 2.0 (1.8–28.6) |
Reproduced and modified from [89] with permission from the publisher.