Table 4.

Incidence of CLNM in overt PTMC patients.

	CLNM positive (%)	CLNM negative (%)	Total	P-value*
Total	106	157	263
Without RFs	7 (6.3%)	104 (93.7%)	111
With at least one RF	99 (65.1%)	53 (34.9%)	152	<0.001
With one RF	8 (57.1%)	6 (42.9%)	14	<0.001
With two RFs	74 (64.3%)	41 (35.7%)	115	<0.001
With three RFs	17 (73.9%)	6 (26.1%)	23	<0.001

CLNM central lymph node metastasis, PTMC papillary thyroid microcarcinoma, RF risk factor.

^*P value was the result of patients without RF vs. patients with RF. The bold values mean the P <0.05.