Pulmonary function tests of idiopathic pulmonary fibrosis(IPF) patients with and without gastro-oesophageal reflux (GER)#
| Parameter | GER present | GER absent | p-value | ||
| Mean±sd | Subjects n | Mean±sd | Subjects n | ||
| FEV1 | |||||
| L·s−1 | 2.0±0.7 | 39 | 1.5±0.4 | 6 | 0.11 |
| % pred | 64±20 | 39 | 60±20 | 6 | 0.69 |
| FVC | |||||
| L·s−1 | 2.5±0.9 | 39 | 1.7±0.4 | 6 | 0.07 |
| % pred | 61±20 | 39 | 53±20 | 6 | 0.40 |
| FEV1/FVC | 0.82±0.07 | 39 | 0.88±0.09 | 6 | 0.057 |
| TLC | |||||
| L | 3.8±1.4 | 36 | 3.2±0.45 | 4 | 0.37 |
| % pred | 62±21 | 36 | 66±21 | 4 | 0.72 |
| DL,CO¶ | |||||
| mL·min−1 | 10.4±4.7 | 37 | 6.2±2.5 | 5 | 0.057 |
| % pred | 38±17 | 37 | 25±11 | 5 | 0.12 |
FEV1: forced expiratory volume in one second; % pred: per cent of normal predicted value; FVC: forced vital capacity; TLC: total lung capacity; DL,CO: carbon monoxide diffusing capacity of the lung. #: IPF subjects not receiving proton pump inhibitor therapy at the time of their oesophageal pH probe study only; ¶: corrected for haemoglobin.