Demographics, smoking and health status for 421 study participants by disease status
| Subject characteristics | HP (n=192) | Referents (n=229) | p-value |
| Demographics | |||
| Age years# | 61.7±13.3 | 63.2±11.8 | |
| Female# | 121 (63) | 139 (61) | |
| White, non-Hispanic | 145 (76) | 184 (80) | 0.23 |
| Annual family income <US$40 000 (n=363) | 57 (31) | 45 (25) | 0.17 |
| Smoking | |||
| Current smoker | 15 (8) | 13 (6) | 0.38 |
| Ever-smoker | 104 (54) | 110 (48) | 0.21 |
| Packs per day among ever-smokers | 0.85±0.68 | 0.69±0.54 | 0.11 |
| Pack-years among ever-smokers | 21.2±23.9 | 17.1±19.0 | 0.18 |
| Comorbidities and health status | |||
| Allergies or hay fever | 102 (55%) | 116 (51%) | 0.61 |
| Hypertension | 69 (36%) | 125 (55%) | <0.001 |
| Diabetes mellitus | 35 (18%) | 32 (14%) | 0.24 |
| Short-form-12 health status | |||
| Physical component score-12 | 38.2±11.3 | 47.8±9.4 | <0.001 |
| Mental component score-12 | 50.9±10.9 | 53.9±8.7 | <0.001 |
Data are presented as mean±sd or n (%), unless otherwise stated. Income missing for 58 subjects; Short-form-12 for 17 subjects. HP: hypersensitivity pneumonitis. #: differences in age and sex not tested, given referent selection criteria.