Auscultation of crackles on chest exam at the initial clinic visit according to type of interstitial lung disease (n=290)
| None | Fine crackles | Coarse crackles | Both | |
| IPF n (%) | 2 (1.6%) | 97 (75.2%) | 7 (5.4%) | 23 (17.8%) |
| Non-IPF n (%) | 25 (15.5%) | 98 (60.9%) | 18 (11.2%) | 20 (12.4%) |
| CTD-related ILD | 5 (9.8%) | 34 (66.7%) | 5 (9.8%) | 7 (13.7%) |
| HP | 6 (15.8%) | 25 (65.8%) | 4 (10.50%) | 3 (7.9%) |
| NSIP | 1 (5.0%) | 14 (70.0%) | 3 (15.0%) | 2 (10.0%) |
| Others | 13 (24.5%) | 25 (47.2%) | 7 (13.2%) | 8 (15.1%) |
| Drug-related ILD | 3 (25.0%) | 6 (50.0%) | 1 (8.3%) | 2 (16.7%) |
| Non-specific PF | 2 (18.2%) | 6 (54.5%) | 2 (18.2%) | 1 (9.1%) |
| Unclassifiable ILD | 1 (9.1%) | 5 (45.5%) | 1 (9.1%) | 4 (36.4%) |
| Smoking-related ILD | 4 (50%) | 2 (25.0%) | 2 (25.0%) | 1 (12.5%) |
| Other | 3 (30.0%) | 6 (60.0%) | 1 (10.0%) | 0 (0.0%) |
CTD, connective tissue disease; HP, hypersensitivity pneumonitis; ILD, interstitial lung disease; IPF, idiopathic pulmonary fibrosis; NSIP, nonspecific interstitial pneumonia.