Table 2. Final diagnoses of study subjects.
| Diagnosis | Number (percentage) |
|---|---|
| Sarcoidosis | 339 (42.2) |
| Stage 0 | 17 (5.0) |
| Stage I | 96 (28.3) |
| Stage II | 138 (40.7) |
| Stage III | 77 (22.7) |
| Stage IV | 11 (3.2) |
| Idiopathic pulmonary fibrosis (IPF) | 170 (21.2) |
| Non-IPF idiopathic interstitial pneumonia | 74 (9.2) |
| Nonspecific interstitial pneumonia | 63 (7.8) |
| Acute Interstitial Pneumonia | 2 (0.2) |
| Cryptogenic Organizing Pneumonia | 4 (0.5) |
| Respiratory Bronchiolitis-ILD/Desquamative Interstitial Pneumonia | 5 (0.6) |
| Connective tissue disease associated ILD | 102 (12.7) |
| Rheumatoid arthritis | 22 (2.7) |
| Systemic sclerosis | 19 (2.3) |
| Mixed connective tissue disease | 4 (0.5) |
| Sjogren’s syndrome | 3 (0.4) |
| Systemic lupus erythematosus | 3 (0.4) |
| Dermatomyositis/Anti-synthetase syndrome | 6 (0.7) |
| Interstitial pneumonia with autoimmune features | 45 (5.6) |
| Hypersensitivity pneumonitis | 86 (10.7) |
| Farmer’s lung | 51 (6.4) |
| Bird fancier’s lung | 13 (1.6) |
| Miller’s lung | 3 (0.4) |
| Other exposures | 2 (0.2) |
| Unknown exposure | 17 (2.1) |
| Drug-induced ILD | 6 (0.7) |
| Bleomycin | 4 (0.5) |
| Methotrexate | 2 (0.3) |
| Occupational lung disease | 7 (0.9) |
| Arc welder’s lung | 1 (0.1) |
| Metal worker’s lung | 1 (0.1) |
| Silicosis | 4 (0.5) |
| Pneumoconiosis, NOS | 1 (0.1) |
| Unclassifiable | 7 (0.9) |
| Others | 12 (1.5) |
| Chronic eosinophilic pneumonia | 2 (0.2) |
| Cystic lung disease, NOS | 1 (0.1) |
| CVID associated LIP | 1 (0.1) |
| IgG4 associated fibrosis | 2 (0.2) |
| Pulmonary alveolar microlithiasis | 1 (0.1) |
| Pulmonary alveolar proteinosis | 2 (0.2) |
| Lymphangiolieomyomatosis | 1 (0.1) |
| Idiopathic pulmonary hemosiderosis | 1 (0.1) |
| Pulmonary Langerhan’s cell histiocytosis | 1 (0.1) |
CVID-common variable immunodeficiency, ILD-interstitial lung disease, LIP-lymphocytic interstitial pneumonia, NOS-not otherwise specified.