Table 2.

Multivariate analysis of risk factors of LLN metastasis

	OR	95% CI	P value
Gender (male vs. female)	1.435	0.982–2.092	0.062
Age (≤ 45 vs. > 45 years)	1.171	0.827–1.658	0.373
Tumor size (> 20 mm vs. ≤ 20 mm)	4.082	2.646–6.289	0.001
Tumor location (upper lobe vs. non-upper lobe)	2.874	1.916–4.310	0.001
Bilaterality (yes vs. no)	1.041	0.657–1.647	0.866
Multifocality (yes vs. no)	1.832	1.083–3.096	0.024
Extra thyroidal extension (yes vs. no)	1.838	1.208–2.801	0.005
Number of CLN metastasis (< 2 vs. ≤ 1)	6.536	4.630–9.259	0.001