| Parameters | Group A(n = 15) | Group G(n = 17) | p Value |
| Age at diagnosis (years)* | 60 (40–72) | 52 (32–73) | NS |
| Sex (M/F) | 5/10 | 6/11 | NS |
| Occupational exposure | 7 | 5 | NS |
| Cleaning products | 4 | 4 | |
| Aluminum | 1 | ||
| Pesticides | 1 | ||
| Asbestos | 1 | ||
| Products used in dental protheses | 1 | ||
| Smokers | 6 | 4 | NS |
Group A, acute onset of interstitial lung disease; group G, gradual onset of interstitial lung disease.
*Results are expressed as median (range). Comparisons were made using the Fisher exact test.