Table 4.

Correlation of severity of traction bronchiectasis with HRCT pattern extents and fibroblastic foci scores on multivariate linear regression within disease subgroups

	HRCT pattern	Partial regression coefficient	P value	95 % CI
*IPF/UIP (n=70) r2 = 0.34	FF score	0.49	<0.0001	0.17–0.80
	Global disease extent	−0.02	0.74	−0.12–0.08
	Extent of reticulation	0.04	0.03	0.00–0.08
	Extent of ground glass	0.01	0.09	−0.02–0.03
	Extent of honeycombing	0.02	0.61	−0.05–0.08
	Extent of consolidation	−0.26	0.63	−1.30–0.79
	Extent of emphysema	−0.31	0.05	−0.60– −0.01
*Fibrotic NSIP (n=43) r2 = 0.58	FF score	0.29	0.29	−0.27–0.86
	Global disease extent	0.03	<0.0001	0.02–0.69
	Extent of reticulation	0.03	0.27	−0.02–0.08
	Extent of ground glass	0.004	0.60	−0.01–0.02
	Extent of honeycombing	0.01	0.76	−0.07–0.09
	Extent of consolidation	0.04	0.74	−0.66–0.91
	Extent of emphysema	−0.31	0.04	−0.60– −0.01
CHP (n=49) r2 = 0.35	FF score	0.72	<0.0001	0.43–1.00
	Global disease extent	−0.02	0.67	−0.13–0.08
	Extent of reticulation	0.03	0.27	−0.02–0.08
	Extent of ground glass	0.004	0.60	−0.01–0.02
	Extent of honeycombing	0.01	0.76	−0.07–0.09
	Extent of consolidation	0.04	0.74	−0.66–0.91
	Extent of emphysema	−0.73	0.05	−1.46– −0.01

*Fibrotic NSIP group = idiopathic fibrotic NSIP (n=25) and CTD-NSIP (n=18) combined. NSIP= non-specific interstitial pneumonia. *IPF/UIP =idiopathic pulmonary fibrosis and connective tissue disease related usual interstitial pneumonia combined. CHP=chronic hypersensitivity pneumonitis