Table 3.

Multivariate analysis of variables, including pathological central node metastasis, for central node recurrence-free survival for cN0M0 PTC patients

Variable	p value	Hazard ratio (95%CI)
Male gender	0.9878	0.99 (0.42–2.36
Age ≥ 55 years	0.0028	2.43 (1.36–4.37)
Extrathyroid extension (Ex)	0.0003	3.14 (1.70–5.81)
Tumor size
>4.0 cm	0.0001	5.10 (2.20–11.90)
2.1–4.0 cm	0.0006	3.34 (1.69–6.67)
Pathologically confirmed	0.0816	1.80 (0.93–3.48)
central node metastasis