Table 3.

Multivariate logistic analysis of risk factors for lymphovascular invasion in training set.

Factors	β	OR	95% CI	P
Tumor size
≤2.5cm	Reference
>2.5cm	1.159	3.186	1.348-7.532	0.008
Depth of invasion
Mucosa	Reference
Submucosa	1.583	4.871	1.082-21.925	0.039
Tumor differentiation
Well or Carcinoma in situ	-1.619	0.198	0.059-0.659	0.008
Moderate	-0.906	0.404	0.182-0.896	0.026
Poor	Reference
LNM
No	Reference
Yes	1.422	4.145	1.991-8.629	<0.001
Multiple lesions, n (%)
No	Reference
Yes	0.231	1.260	0.411-3.859	0.686

LNM, Lymph node metastasis; I = superficial and protruding type; II = flat type; III = superficial and excavated type.

The bold values mean statistical significance.