Patient characteristics
| Age years | 74±9 |
| Males | 165 (65%) |
| Duration of IPF years | 3.9±2.5 |
| Education years | 10±4 |
| Living alone | 70 (28%) |
| Working | 22 (9%) |
| Smoking status# | |
| Smokers | 26 (10%) |
| Ex-smokers | 109 (43%) |
| Never-smokers | 118 (47%) |
| FVC# L | 3.0±0.9 |
| FVC# % of predicted | 83±17% |
| Comorbidities | |
| Hypertension | 105 (42%) |
| Coronary heart disease | 64 (25%) |
| Diabetes | 50 (20%) |
| Heart insufficiency | 46 (18%) |
| COPD | 43 (17%) |
| Cancer¶ | 41 (16%) |
| Asthma | 24 (10%) |
| Others | 93 (37%) |
| No comorbidities | 53 (21%) |
| Comorbidities n | 1.8±1.5 |
Data are presented as mean±sd unless otherwise stated. IPF: idiopathic pulmonary fibrosis; FVC: forced vital capacity; COPD: chronic obstructive pulmonary disease. #: smoking status and FVC were recorded at the time of diagnosis, and other factors at the time of questionnaire; ¶: including three patients with lung cancer.