Table 3– Correlation between high-resolution computed tomography (HRCT) score and impedance–pH findings (acid exposure time and impedance-detected reflux episodes) with the presence/concentration of pepsin and bile acids in saliva and bronchoalveolar lavage fluid (BALF) in idiopathic pulmonary fibrosis patients

	HRCT score		Acid exposure time		Total number of reflux episodes
	r²	p-value	r²	p-value	r²	p-value
Presence of pepsin in saliva	0.5260	<0.001	0.2193	0.003	0.4007	<0.001
Presence of bile acids in saliva	0.4269	<0.001	0.1493	0.017	0.5264	0.001
Concentration of bile acids in saliva	0.2591	0.013	0.0129	0.606	0.0712	0.218
Presence of pepsin in BALF	0.6033	<0.001	0.2344	0.026	0.2845	0.013
Presence of bile acids in BALF	0.4605	0.001	0.3660	0.004	0.4566	0.001
Concentration of bile acids in BALF	0.3843	0.024	0.0427	0.498	0.3558	0.031