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

Table 2 Optimal scale regression analysis of lateral lymph node metastasis

Variable	Beta	Standardized coefficient std. error	Df	F	Sig	Tolerance		Importance
						After transformation	Before transformation
Sex	0.007	0.028	1	0.058	0.809	0.911	0.911	0.003
Primary tumor size	0.132	0.045	1	8.477	0.004	0.958	0.956	0.104
Tumor location	0.119	0.044	1	7.449	0.007	0.974	0.975	0.055
ETE	0.076	0.043	1	3.153	0.077	0.959	0.959	0.049
Prelaryngeal LNM	0.142	0.049	1	8.338	0.004	0.879	0.871	0.168
Pretracheal LNM	0.197	0.051	1	14.773	0.000	0.836	0.831	0.260
Ipsilateral paratracheal LNM	0.239	0.049	1	23.330	0.000	0.794	0.798	0.382

PTC: Papillary carcinoma; ETE: Extrathyroid extension; LNM: Lymph node metastasis.