Table 4 Univariate analysis of the risk factors for lymph node metastases

 Male vs female

0.87 (0.51–1.49)

0.613

 ≤60 vs >60

0.85 (0.54–1.35)

0.494

 Cervical/upper vs middle/lower

0.89 (0.51–1.54)

0.669

 ≤2 vs >2 cm

2.56 (1.59–4.13)

<0.05*

 I + I–II vs II + II–III + III

2.85 (1.73–4.71)

<0.05*

 m1 to m3 vs sm1 to sm3

8.09 (3.45–18.98)

<0.05*

 Absent vs present

2.78 (0.80–9.72)

0.109

 Absent vs present

5.95 (2.81–12.57)

<0.05*