Table 1 Baseline Clinicopathological Characteristics

Sex

Female

3,668 (75.3%)

Male

1,204 (24.7%)

Age group

≥ 55 years

724 (14.9%)

<55 years

4,148 (85.1%)

Tumor size

≤ 7 mm

3,371 (69.2%)

>7 mm

1,501 (30.8%)

Tumor location

upper

1,143 (23.5%)

middle

2,534 (52.0%)

lower

1,195 (24.5%)

Hashimoto’s thyroiditis

1,093 (22.4%)

LVI

31 (0.6%)

ETE

2,124 (43.6%)

ENE

175 (3.6%)

pT stage

1a

4,760 (97.7%)

3b

90 (1.8%)

4a

22 (0.5%)

pN stage

0

2,988 (61.3%)

1a

1,727 (35.4%)

1b

157 (3.2%)

pTNM stage

I

4,676 (96.0%)

II

192 (3.9%)

III

4 (0.1%)

ATA risk

low

2,642 (54.2%)

intermediate

2,117 (43.5%)

high

112 (2.3%)