Table 2.

Multivariate analysis of risk factors of PTC recurrence.

Variables	Odds ratio of recurrence	P value
Gender (male)	1.67 (1.02,2.70)	0.042
Age (≥50 years)	2.11 (1.51,3.23)	0.002
Primary tumor size (≥1 cm)	1.26 (1.01,2.47)	<0.001
Differentiation of primary tumor	5.01 (2.33,9.62)	<0.001
Lymph node metastasis	3.27 (1.34,6.89)	<0.001
Multifocality	1.74 (1.03,3.25)	<0.001