Table 2.

Results of the log-rank test and univariate and multivariate Cox regression analysis.

Variable	Log-Rank Test	Univariate Analysis		Multivariate Analysis
	P value	HR (95%CI)	P value	HR (95%CI)	P value
Sex	0.270
Female		Reference		Reference
Male		0.944 (0.851-1.047)	0.275	0.998 (0.899-1.108)	0.973
Age at diagnosis (years)	<0.001
≤19		Reference		Reference
≥20		0.802 (0.721-.892)	<0.001	0.908 (0.812-1.016)	0.092
Race	0.002
White		Reference		Reference
Others/Unknown		1.210 (1.069-1.370)	0.003	1.003 (0.885-1.137)	0.959
Tumor Size	<0.001
≤3cm		Reference		Reference
>3cm		1.662 (1.462-1.889)	<0.001	1.240 (1.079-1.424)	0.002
Unknown		1.408 (1.227-1.616)	<0.001	1.159 (1.008-1.332)	0.038
Behavior	<0.001
Malignant		Reference		Reference
Benigan and Borderline		0.212 (0.155-0.290)	<0.001	0.507 (0.366-0.703)	<0.001
Surgery	<0.001
None/Unknown		Reference		Reference
Yes		0.337 (0.299-0.380)	<0.001	0.337 (0.298-0.381)	<0.001
Radiation	<0.001
None/Unknown		Reference		Reference
Yes		3.651 (3.235-4.121)	<0.001	2.832 (2.465-3.254)	<0.001
Chemotherapy	<0.001
None/Unknown		Reference		Reference
Yes		2.188 (1.972-2.428)	0.001	1.234 (1.100-1.384)	<0.001