Table 3.
Initial symptoms and diagnostic tests of idiopathic pulmonary fibrosis patients
| Symptoms and diagnostic tests | No. (%) |
|---|---|
| Symptoms | |
| Asymptomatic | 308 (14.4) |
| Cough | 1,077 (50.4) |
| Sputum | 618 (28.9) |
| Dyspnea | 1,112 (52.0) |
| mMRC | 1.4±1.0 |
| Fever | 36 (1.7) |
| Chest pain | 57 (2.7) |
| Weight loss | 44 (2.1) |
| 6-minute walk test (mean±SD) (n=1,088) | |
| Walk distance (m) | 399±182 |
| Minimum saturation (%) | 90.3±14.1 |
| Arterial blood gas (mean±SD) (n=950) | |
| PaO2 (mm Hg) | 92.4±42.7 |
| PaCO2 (mm Hg) | 36.1±12.4 |
| Pulmonary function test (mean±SD) | |
| FVC (L) | 2.77±1.57 |
| FVC, % predicted | 74.6±17.5 |
| FEV1 (L) | 2.49±8.01 |
| FEV1, % predicted | 85.2±19.1 |
| DLco (mL/mm Hg/min) | 11.92±5.58 |
| DLco, % predicted | 63.6±22.0 |
| CT patterns | |
| UIP pattern | 972 (45.4) |
| Probable UIP pattern | 907 (42.4) |
| Inconsistent with UIP pattern | 124 (5.8) |
| CT findings | |
| Honeycombing | 1,434 (67.0) |
| GGO | 1,256 (58.7) |
| Emphysema | 699 (32.7) |
| GAP stage | |
| Stage I | 1,026 (56.9) |
| Stage II | 589 (32.7) |
| Stage III | 187 (10.4) |
Values are presented as number (%) or mean±SD.
mMRC: modified Medical Research Council dyspnea scale; PaO2: arterial partial pressure of oxygen; PaCO2: arterial partial pressure of carbon dioxide; FVC: forced vital capacity; FEV1: forced expiratory volume in 1 second; DLco: diffusing capacity for carbon monoxide; CT: computed tomography; UIP: usual interstitial pneumonia; GGO: ground glass opacity; GAP: gender-age-physiology.