Table 2.

The risk factors of predicted lymph node metastasis

	Lymph nodes metastasis
	Univariate	Multivariate
	P value	P value	Hazard Ratio
Gender	0.678
Age (year)	< 0.001	< 0.001	0.976–0.982
Race	< 0.001	< 0.001	1.053–1.174
Size (mm)	< 0.001	0.053	1–1.003
Mucinous	0.016	0.085	0.985–1.267
Grade	< 0.001	< 0.001	1.612–1.827
Depth of invasion	< 0.001	< 0.001	1.045–1.061