Table 4. Cox proportional hazards analysis for overall survival rate.

Covariate	HR	95% CI	P value
CCI	19.613	5.353–71.865	< 0.001
No. of spinal metastasis	2.244	1.048–4.233	0.044
Corpectomy	0.715	0.451–0.880	0.022
Spondylectomy	0.619	0.021–0.822	0.015
Time to metastasisa	0.487	0.128–0.826	0.045
Postop. chemotherapy	0.455	0.031–0.708	0.031

A P value of < 0.05 was considered to indicate statistical significance. The boldface type indicates statistical significance.

HR = hazard ratio, CI = confidence interval, CCI = Charlson comorbidity index, Postop = postoperative.

^aTime to metastasis from diagnosis of non-small cell lung cancer.