Table 4.

Analyses of the Clinical Pathological Factors for PTC Patients with pN1a or pN1b Using Multinomial Logistic Regression

	N1a (N0 as a Reference)		N1b (N1a as a Reference)
Variables	OR (95% CI)	P	OR (95% CI)	P
TPOAb	1 (0.999–1)	0.092	1 (0.999–1)	0.478
TgAb	1 (0.999–1.001)	0.963	1.001 (1–1.001)	0.009
Tumor size	2.101 (1.794–2.460)	<0.001	1.832 (1.585–2.117)	<0.001
Age (>45y)	0.972 (0.964–0.979)	<0.001	0.993 (0.983–1.004)	0.197
Female	0.521 (0.423–0.642)	<0.001	0.738 (0.565–0.963)	0.025
ETE	1.446 (1.216–1.719)	<0.001	1.415 (1.098–1.825)	0.007
Unifocal	0.802 (0.612–1.052)	0.111	0.921 (0.608–1.394)	0.697
Unilateral	0.837 (0.641–1.14)	0.259	0.708 (0.457–1.098)	0.123
LV invasion	2.204 (0.851–5.706)	0.104	0.927 (0.440–1.953)	0.843
Intrathyroidal spreading	2.480 (1.578–3.896)	<0.001	2.295 (1.580–3.332)	<0.001
HT	0.846 (0.667–1.072)	0.167	1.336 (0.952–1.876)	0.094
Classic subtype	1.281 (0.81–2.026)	0.289	0.760 (0.427–1.352)	0.351

Note: Variables in bold show statistical significance.

Abbreviations: HT, Hashimoto thyroiditis; ETE, extrathyroidal extension; LV invasion, lymphatic vascular invasion.