Table 4. Prognostic factors of patients for survival: the multivariate cox regression model.

Variables	Hazard ratio	95% CI	p Value	Variables	Hazard ratio	95% CI	p Value
	Model 1				Model 2
Diagnosis, IPF	16.1	3.96–65.2	<0.001	Diagnosis, IPF	14.7	2.20–97.5	0.005
Age	1.07	0.973–1.18	0.611	Age	1.03	0.919–1.15	0.620
Sex, male	4.94	0.888–27.5	0.0681	Sex, male	5.35	0.796–36.0	0.0844
CCI	1.20	0.591–2.45	0.611	CCI	1.01	0.483–2.11	0.979
FVC % predicted	0.984	0.956–1.01	0.268	FVC % predicted	0.898	0.794–1.02	0.086
DLCO % predicted	0.967	0.929–1.01	0.102	DLCO % predicted	0.998	0.959–1.04	0.923
				Acute exacerbation of ILD	32.6	5.48–193.7	<0.001

CCI: Charlson comorbidity index; DL_co: diffuse capacity of the lung for carbon monoxide; FVC: forced vital capacity; ILD: interstitial lung disease; IPF: idiopathic pulmonary fibrosis