Table 1.

Demographic characteristics of the patients. Data are presented as mean ± s.d. or as n (%).

Characteristics	Values
n	935
Age, years	46.8 ± 11.6
BMI	24.8 ± 4.0
Height	162.4 ± 8.5
Body weight	65.9 ± 13.8
Sex
Male	227 (24.3%)
Female	708 (75.7%)
Maximal tumor size, cm*	0.82 ± 0.34
Multifocality
No	732 (78.3%)
Yes	203 (21.7%)
Minimal ETE
No	534 (57.1%)
Yes	401 (42.9%)
Vascular invasion
No	840 (89.8%)
Yes	95 (10.2%)
Lymphatic invasion
No	595 (63.6%)
Yes	340 (36.4%)
Occult central LN metastasis
No	653 (69.8%)
Yes	282 (30.2%)
AJCC 8th edition stage
I	869 (92.9%)
II	66 (7.1%)
Hashimoto or lymphocytic thyroiditis
No	690 (73.8%)
Yes	245 (26.2%)
Surgical procedure
Lobectomy	935 (100.0%)
Central neck dissection	770 (82.4%)

*In preoperative USG.

AJCC, American Joint Committee on Cancer; BMI, body mass index; CND, central neck dissection; ETE, extrathyroidal extension; LN, lymph node; USG, ultrasonography.