Table 2.

Cox proportional hazards regression model for overall survival.

Characteristic	Univariate		Multivariate
	HR.CI95	P	HR (95% CI)	P
Age
Younger	1.00 [reference]		1.00 [reference]
Old	3.99 [2.66–5.98]	< 0.001	3.52 [2.33–5.31]	< 0.001
Sex
Female	1.00 [reference]		1.00 [reference]
Male	1.82 [1.23–2.68]	0.003	1.73 [1.15–2.61]	0.009
Race (%)
White	1.00 [reference]		1.00 [reference]
Black	0.6 [0.28–1.29]	0.192	0.71 [0.32–1.55]	0.387
Other	0.98 [0.52–1.82)]	0.939	1.09 [0.58–2.04]	0.791
Unknown	0 [0–Inf]	0.994	0.00 [0.00–Inf]	0.995
Marital (%)
Marry	1.00 [reference]		1.00 [reference]
Single	1.42 [0.73–2.76]	0.299	1.69 [0.85–3.35]	0.132
Other	1.21 [0.8–1.84]	0.373	1.41 [0.91–2.19]	0.122
Grade (%)
Well	1.00 [reference]		1.00 [reference]
Moderate	1.71 [1.04–2.8]	0.034	1.66 [1.01–2.73]	0.048
Tumor size (%)
≤ 1 cm	1.00 [reference]		1.00 [reference]
1–2 cm	0.71 [0.49–1.04]	0.081	0.80 [0.54–1.18]	0.257
Surgery
No	1.00 [reference]		1.00 [reference]
Yes	0.41 [0.26–0.65]	< 0.001	0.53 [0.33–0.84]	0.007
Primary tumor size
Head	1.00 [reference]		1.00 [reference]
Body and tail	0.95 [0.59–1.53]	0.840	0.87 [0.54–1.40]	0.556
Other	1.18 [0.68–2.06]	0.551	0.99 [0.56–1.74]	0.961