Baseline characteristics of patients with idiopathic pulmonary fibrosis with or without lung cancer diagnosis during follow-up periods
| Characteristics | All patients | Patients with lung cancer | Patients without lung cancer | p-value |
| Patients | 632 | 70 | 562 | |
| Age years | 69.5±8.5 | 66.8±7.9 | 69.8±8.5 | 0.006 |
| Males % | 76.4 | 94.3 | 74.2 | <0.001 |
| BMI kg·m−2 | 23.2±3.1 | 23.2±2.9 | 23.2±3.1 | 0.996 |
| Smoking exposure pack-years | 35.0 (0–141) | 46.4 (0.75–120) | 31.0 (0–141) | <0.001 |
| Smokers % | 76.4 | 100 | 73.5 | <0.001 |
| Emphysema % | 29.7 | 60.0 | 26.0 | <0.001 |
| FVC % pred | 76.2±20.2 | 89.2±16.9 | 75.1±20.1 | <0.001 |
| FEV1/FVC % | 80.3±10.8 | 74.1±9.4 | 80.9±10.7 | <0.001 |
| DLCO % pred | 76.4±23.5 | 74.9±26.9 | 76.6±23.2 | 0.517 |
| PaO2 mmHg | 74.0±15.1 | 77.3±12.2 | 73.5±15.4 | 0.194 |
| ESR mm·h−1 | 34.0 (2–138) | 36.5 (5–120) | 34.0 (2–138) | 0.665 |
| CRP mg·dL−1 | 0.24 (0.00–50.68) | 0.29 (0.00–15.11) | 0.23 (0.00–50.68) | 0.819 |
| Albumin g·dL−1 | 4.0±0.5 | 4.0±0.4 | 4.0±0.5 | 0.763 |
| KL-6 U·mL−1 | 762.0 (149–9705) | 649.5 (347–2454) | 775.0 (149–9705) | 0.078 |
Data are presented as mean±sd or median (range), unless otherwise stated. BMI: body mass index; FVC: forced vital capacity; FEV1: forced expiratory volume in 1 s; DLCO: diffusing capacity of the lung for carbon monoxide; PaO2: arterial oxygen tension; ESR: erythrocyte sedimentation rate; CRP: C-reactive protein; KL: Krebs von der Lungen. p-values were calculated in relation to with or without lung cancer diagnosis.