Table 4. Rate of occult lymph node metastasis in the low-, moderate-and high-risk groups.

Group	N(+) (%)	N(0)(%)	Total (n)	p value
Low risk	4.3	95.7	23
Moderate risk	22.7	77.3	22	<0.001
High risk	88.9	11.1	9
Total	25.9	74.1	54