Gastro-oesophageal reflux (GOR) symptoms and hiatal hernia at diagnosis of interstitial lung disease of the 182 patients
| IPF | CHP | SSc | Non-SSc CTD | p-value | |
| Subjects | 79 | 32 | 17 | 54 | |
| GOR symptoms | 36/78 (46) | 5/22 (23) | 8/13 (62) | 9/35(26) | 0.034 |
| Patients treated with a PPI | 57/77 (74) | 18/31 (58) | 15/17 (88) | 26/52 (50) | 0.029 |
| Presence of hiatal hernia on CT scan | 42/79 (53) | 9/32 (28) | 10/17 (59) | 18/54 (33) | 0.017 |
| Presence of type II, III or IV hiatal hernia | 11/79 (14) | 1/32 (3) | 1/17 (6) | 1/54 (2) | 0.005 |
| Oesophageal or intra-thoracic stomach area mm2 | 339 (75–6406) | 254 (94–659) | 505 (150–1648) | 243 (102–650) | 0.014 |
| Presence of air in the oesophagus | 72/79 (91) | 27/32 (84) | 17/17 (100) | 51/54 (94) | 0.229 |
| Presence of food/fluid/air-fluid level in the oesophagus | 7/79 (9) | 2/32 (6) | 5/17 (29) | 1/54 (2) | 0.005 |
Data are presented as n, n/N (%) or median (range), unless otherwise stated. IPF: idiopathic pulmonary fibrosis; CHP: chronic hypersensitivity pneumonitis; SSc: scleroderma; CTD: connective tissue disease; PPI: proton pump inhibitor; CT: computed tomography.