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Multivariate analysis of potential risk factors for LNM
| Variable | OR | 95% CI | P |
| LNM, lymph node metastasis; OR, odds ratio; 95% CI; 95% confi dence interval. | |||
| Histological type | |||
| Well differentiated | 1 | ||
| Poorly or undifferentiated | 3.852 | 1.658-8.948 | 0.002 |
| Vascular or lymphatic invasion | |||
| Negative | 1 | ||
| Positive | 4.907 | 0.758-31.775 | 0.095 |
