Table 4.

Multivariate analysis for risk factors of the false negative rate in sentinel lymph node biopsy.

Variables	Odds ratio	95% CI	P
Number of metastatic lymph nodes	2.801	1.159–6.771	0.022
Number of dissected SLNs	0.461	0.269–0.790	0.005
Tumor size	0.223	0.047–1.050	0.058

CI, confidence interval; SLNs, sentinel lymph nodes.