Table 4.

Survival analysis with Cox proportional hazard model

Variable	Univariate			Multivariate
	HR	95 % CI	p-value	HR	95 % CI	p-value
Age	1.015	1.002–1.028	0.028	1.018	1.005–1.031	0.006
Sex (M/F)	1.184	0.890–1.575	0.245	1.264	0.949–1.684	0.109
FVC (%)	0.985	0.978–0.992	<0.001	0.986	0.979–0.993	<0.001
DLCO (%)	0.987	0.981–0.993	<0.001	0.989	0.983–0.995	0.001

FVC forced vital capacity, % pred percentage of the predicted value, DL _CO, diffusing capacity of the lung for carbon monoxide