Low urinary iodine is a protective factor of central lymph node metastasis in papillary thyroid cancer: a cross-sectional study

Table 4 Risk factors of central lymph node metastasis for PTC patients

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

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