Table 6 Multivariate analysis of risk factors for lateral lymph node metastasis

Age (years)

0.447^a

≤35

1.64

0.87

3.09

0.125

35–45

1.26

0.66

2.40

0.478

45–55

1.46

0.78

2.75

0.236

> 55

1

Tumor size(cm)

0.060^a

≤0.5

1

0.5–1.0

1.0–2.0

1.57

1.94

0.67

0.84

3.63

4.51

0.297

0.121

> 2.0

3.03

1.24

7.44

0.015

Extrathyroidal extension

(yes vs. no)

1.26

0.78

2.02

0.350

The number of CLNM

< 0.001^a

0

1

1–3

2.96

1.87

4.70

< 0.001

> 3

9.27

4.38

19.63

< 0.001