Development of a nomogram for prediction of central lymph node metastasis of papillary thyroid microcarcinoma

BMC Cancer

Table 3 The features of 5 variables between training and validation cohorts

	Factors	Training cohort (n = 269)	Validation cohort (n = 108)	X²/W	P
Gender				0.69046	0.406
	Male	55	27
	Female	214	81
Multifocality				1.2256	0.268
	Negative	215	80
	Positive	54	28
Boundary				0.11573	0.734
	Clear	124	47
	Unclear	145	61
CLNM				2.4682	0.116
	Positive	78	41
	Negative	191	67
Age		43.50 ± 11.20	44.20 ± 11.40	14230	0.757
Tumor Size		0.63 ± 0.22	0.64 ± 0.22	13944	0.540

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