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| Grade of tumor | Neck lymph node metastasis | p -value | |
|---|---|---|---|
| Yes | No | ||
| Well-differentiated | 1 (4.3%) | 22 (95.7%) | 0.001 |
| Moderately-differentiated | 10 (25.6%) | 29 (74.4%) | |
| Poorly-differentiated | 9 (56.2%) | 7 (43.8%) | |
| Total | 20 (25.6%) | 58 (74.4%) | |
