TABLE 1.
Clinical characteristics of the 826 patients
| Characteristics | Number of patients (n) | ||
|---|---|---|---|
| Total | 826 | ||
| Age, years | Median (range) | 67 | 19–89 |
| Sex, n | Male | 476 | 57.6% |
| Female | 350 | 42.4% | |
| Smoking status, n | Non‐smoker | 321 | 40.0% |
| Ex/current smoker | 481 | 60.0% | |
| Final diagnosis, n | CFIP without AE | 246 | 29.8% |
| Sarcoidosis | 187 | 22.6% | |
| AE of CFIP/ARDS | 36 | 4.4% | |
| Others | 357 | 43.2% | |
| Pulmonary function tests, n | %VC ≥ 65% | 419 | 76.5% |
| FEV1/FVC ≥ 80% | 328 | 59.9% | |
Abbreviations: AE, acute exacerbation; ARDS, acute respiratory distress syndrome; CFIP, chronic fibrotic interstitial pneumonia; FEV1/FVC, forced expiratory volume in 1 s divided by forced vital capacity; VC, vital capacity.