Table 2. Results of multivariate survival analysis of model cohort and validation cohort.

Parameters	Coefficient	HR	Lower 95% CI	Higher 95% CI	P value
Model cohort
BNP	0.221	1.248	1.155	1.348	<0.001
ALB	−0.049	0.952	0.931	0.974	<0.001
Age	0.033	1.033	1.022	1.044	<0.001
GLB	0.056	1.057	1.038	1.077	<0.001
Smoking_year	0.010	1.011	1.006	1.015	<0.001
PaCO2	0.012	1.012	1.007	1.017	<0.001
GR	0.018	1.018	1.010	1.026	<0.001
Bun	0.040	1.041	1.017	1.066	0.001
Validation cohort
BNP	0.194	1.214	1.128	1.308	<0.001
ALB	−0.081	0.922	0.904	0.941	<0.001
Age	0.030	1.030	1.019	1.041	<0.001
GLB	0.049	1.050	1.031	1.068	<0.001
Smoking_year	0.008	1.008	1.004	1.012	<0.001
PaCO2	0.015	1.015	1.009	1.020	<0.001
GR	0.016	1.016	1.008	1.024	<0.001
Bun	0.029	1.029	1.006	1.054	0.015