Table 2.

Selected variables by multivariate Cox regression analysis

characteristic	Multivariate analysis
	HR	95%CI	P
Age	1.035	1.028–1.043	< 0.001
Sex
Male	Reference
Female	0.742	0.625–0.880	< 0.001
Marital status
Married	Reference
Unmarried	1.337	1.121–1.595	0.001
Grade
I	Reference
II	4.731	3.774–5.931	< 0.001
III	9.060	7.015–11.700	< 0.001
IV	8.670	4.383–17.267	< 0.001
AJCC TNM stage
I	Reference
II	1.314	0.928–1.862	0.124
III	1.472	1.050–2.062	0.025
IV	3.289	2.385–4.535	< 0.001
Insurance
Insured	Reference
Medicaid	1.467	1.128–1.909	0.004
Uninsured	1.673	1.072–2.612	0.024
Surgery
Yes	Reference
No	4.147	3.377–5.092	< 0.001
Chemotherapy
Yes	Reference
No	0.820	0.677–0.992	0.04

HR Hazard ratio; CI Confidence interval