Table 2.

Disease specific survival in univariate analysis and multivariate models

Clinicopathologic Variables	Univariable			Multivariable
	HR	95% CI	P	HR	95%CI	P
Age (per year increase)	1.03	1.00 to 1.06	.02	1.00	.97 to 1.04	.98
Race
Non-Black	Ref.			Ref.
Black	5.87	1.76 to 19.55	.004	5.59	.84 to 37.38	.08
BMI
Normal	Ref.			Ref.
Overweight	1.34	.59 to 3.06	.49	1.82	.64 to 5.22	.26
Obese	2.65	1.07 to 6.59	.04	5.01	1.69 to 14.81	.004
Smoking
Never	Ref.			Ref.
Former	1.24	.55 to 2.78	.60	2.00	.74 to 5.38	.17
Current	.97	.40 to 2.34	.94	.67	.17 to 2.66	.57
Diabetes Mellitus
No	Ref.			Ref.
Yes	2.47	.86 to 7.09	.09	.80	.23 to 2.81	.73
T stage
T1	Ref.			Ref.
T2	2.06	1.02 to 4.19	.05	1.73	.71 to 4.25	.23
Tumor Grade
1	Ref.			Ref.
2	3.63	1.09 to 12.11	.04	3.14	.67 to 14.68	.15
3	6.32	1.40 to 28.57	.02	4.35	.74 to 25.45	.10
Perineural Invasion
No	Ref.			Ref.
Yes	4.97	2.00 to 12.34	.001	3.44	1.21 to 9.76	.02
Vascular Invasion
No	Ref.			Ref.
Yes	3.67	1.68 to 8.05	.001	2.42	.86 to 6.80	.09
Lymph Node
Involvement
No	Ref.			Ref.
Yes	2.69	1.33 to 5.42	.006	2.73	0.77 to 9.69	.12
Postoperative
Radiation
No	Ref.			Ref.
Yes	1.58	.78 to 3.17	.20	.46	.12 to 1.69	.24

Abbreviations: BMI, body mass index; Ref, reference (HR = 1.0)