Table 3.

Univariate and multivariate analyses of independent factors associated with the decisions for treatment

	Univariate			Multivariate
	OR	95% CI	P-value	OR	95% CI	P-value
Age (per 1 year)	0.808	0.751–0.868	<0.001	0.798	0.714–0.892	<0.001
COPD grade	0.498	0.361–0.687	<0.001	0.455	0.248–0.836	0.011
Clinical staging	0.347	0.260–0.463	<0.001	0.320	0.220–0.468	<0.001
DLCO	1.101	1.067–1.136	<0.001	1.078	1.021–1.139	0.007

Abbreviations: OR, odds ratio; CI, confidence interval; DLCO, diffusion capacity for carbon monoxide of lung.