Table 3 Uni- and Mulit-logistic regression analysis for predicting risk of LLNM in the present study

Sex

0.02

0.08

 Female

1

1

 Male

1.68 [1.10, 2.56]

1.92 [0.93, 3.94]

Age (year)

0.84

 < 55

1

 ≥ 55

1.04 [0.68, 1.60]

Dimension (cm)

0.00

0.10

 ≤ 2.95

1

1

 > 2.95

2.47 [1.63, 3.72]

1.17 [0.96, 1.43]

Multifocality

0.22

 No

1

 Yes

1.30 [0.85, 1.97]

Bilaterality

0.25

 No

1

 Yes

1.32 [0.82, 2.13]

Extrathyroidal invasion

0.00

0.72

 No

1

1

 Yes

2.33 [1.51, 3.58]

1.13 [0.56, 2.28]

Lymphocytic thyroiditis

0.55

 No

1

 Yes

0.84 [0.48, 1.47]

Histological type

0.03

0.84

 Classic papillary

1

1

 Other subtypes

0.61 [0.39, 0.95]

1.09 [0.48, 2.46]

TDS

0.00

0.00

0.93

1.08

 ≤ -0.21

1

1

 > -0.21

0.17 [0.11, 0.26]

0.09 [0.04, 0.21]

Absence of preoperative LN assessment

0.15

 No

1

 Yes

1.48 [0.87, 2.52]

Excised cervical LN number

0.00

0.00

0.77

1.31

 ≤ 21.5

1

1

 > 21.5

34.76 [17.75, 68.04]

12.30 [4.35, 34.77]

CLNM

0.00

0.00

0.78

1.29

 No

1

1

 Yes

34.89 [15.86, 76.76]

1.07 [1.04, 1.10]