Relationship between subgroups of central and lateral lymph node metastasis in clinically node-negative papillary thyroid carcinoma

Table 4 Optimal scale regression analysis of ipsilateral level-III lymph node metastasis

Variable	Beta	Standardized coefficient std. error	Df	F	Sig	Tolerance		Importance
						After transformation	Before transformation
Primary tumor size	0.121	0.050	1	5.833	0.016	0.968	0.961	0.120
ETE	0.051	0.042	1	1.528	0.217	0.965	0.963	0.036
Prelaryngeal LNM	0.079	0.049	1	2.569	0.078	0.935	0.876	0.084
Pretracheal LNM	0.216	0.054	1	16.140	0.000	0.874	0.849	0.408
Ipsilateral paratracheal LNM	0.200	0.056	1	12.686	0.000	0.905	0.836	0.351

ETE: Extrathyroid extension; LNM: Lymph node metastasis.