Evaluation of high-resolution computed tomography and pulmonary function tests in patients with chronic hepatitis C virus infection

Table 4 Multiple linear regression analysis of high-resolution computed tomography (HRCT) score, pulmonary function test, Kn odell histological activity index (KHAI), age, sex and smoking in patients with chronic hepatitis C virus infection

	Independent variables
Dependent	Whole regression equation			KHAI			Age			Sex			Smoking
variables	R2	F	p	β	t	p	β	t	p	β	t	p	β	t	p
HRCT score	0.17	5.4	0.028	a	a	a	0.42	2.3	0.028	a	a	a	a	a	a
VC	0.19	6.1	0.020	a	a	a	-0.44	-2.5	0.020	a	a	a	a	a	a
FVC	0.24	8.0	0.009	a	a	a	-0.49	-2.8	0.009	a	a	a	a	a	a
FEV1	0.25	8.6	0.007	a	a	a	-0.50	-2.9	0.007	a	a	a	a	a	a
FEF25-75	0.30	11.1	0.003	a	a	a	-0.55	-3.3	0.003	a	a	a	a	a	a
DLCO	0.16	4.9	0.036	a	a	a	-0.40	-2.1	0.036	a	a	a	a	a	a
DLCO/VA	0.22	3.5	0.047	0.55	2.2	0.04	-0.66	-2.6	0.015	a	a	a	a	a	a

a: Not significant, R²: squared multiple correlation coefficient, F: F value, β: Partial correlation coefficients, t: t value of regression coefficients.