TABLE 5.

Comparison of patients with and without LNmM, stratifying by overall risk factors and postoperative radiation

	Total (N=129)	Recurred (N=11)	LNmM (+) who recurred (N=2)	LNmM (−) who recurred (N=9)	Incidence rate ratios (95% CI)
Overall risk
Low	80	4	0	4	0.7 (0.04–13.3)
Intermediate	21	2	0	2	0.5 (0.03–10.9)
High	28	5	2	3	3.0 (0.5–17.7)
Postoperative radiation
Received	29	4	0	4	0.2 (0.01–3.6)
None	100	7	2	5	2.8 (0.5–14.5)

Categories without a recurrence was assigned a value of 0.5. There were no differences between the groups as all confidence intervals (CI) crossed 1.

LNmM indicates lymph node micrometastasis.