Table 4.

Risk factors of central lymph node metastasis for PTC patients

Variables	CLNM		P value
	Yes	No
Age
≥ 45	53	102	< 0.001
< 45	113	91
Sex
Male	53	51	0.252
Female	113	142
BMI, kg/m2
≥ 24	92	113	0.551
< 24	74	80
Tumor size
≥ 1 cm	74	51	< 0.001
< 1 cm	92	142
Multifocality
Yes	69	62	0.064
No	97	131
Capsular invasion
Yes	120	133	0.484
No	46	60
Nodular goiter
Yes	41	58	0.258
No	125	135
Chronic thyroiditis
Yes	46	48	0.542
No	120	145
Thyroid adenoma
Yes	3	2	0.666
No	163	191
Variant subtype
Classic	135	126	< 0.001
Follicular	15	50
Classic and follicular (multiple foci)	16	17