Table 3 Univariate and multivariate logistic regression analysis of characteristics associated with lateral lymph node metastasis

Age(years)

0.015

0.020

> 45

0.488

0.267–0.891

0.019

0.030

0.206–0.921

0.030

30–45

0.933

0.520–1.674

0.817

0.999

0.511–1.952

0.998

≤ 30

1.000

1.000

Gender

0.006

0.030

Male

2.089

1.239–3.520

1.916

1.064–3.452

Female

1.000

1.000

Tumor size

0.010

0.002

≥ 20 mm

2.328

1.221–4.437

3.212

1.535–6.822

< 20 mm

1.000

1.000

Location

0.013

< 0.001

Upper lobe

1.992

1.159–3.423

3.874

1.997–7.517

Others

1.000

1.000

Multifocality

< 0.001

0.006

Present

2.728

1.751–4.251

3.108

1.378–7.009

Absent

1.000

1.000

Bilaterality

0.002

0.991

Present

2.029

1.287-3.200

1.005

0.429–2.353

Absent

1.000

1.000

Extra-thyroidal extension

< 0.001

0.022

Present

2.566

1.592–4.137

1.962

1.104–3.487

Absent

1.000

1.000

Extra-nodal extension

< 0.001

0.024

Present

4.333

2.295–8.184

2.227

1.111–4.464

Absent

1.000

1.000

CLNM

< 0.001

< 0.001

Present

5.611

3.480–9.045

5.299

2.948–9.527

Absent

1.000

1.000