Table 4.

Univariate analysis of the risk factors for lymph node metastases

Variables	OR (95 % CI)	p value
Gender
Male vs female	0.87 (0.51–1.49)	0.613
Age
≤60 vs >60	0.85 (0.54–1.35)	0.494
Tumor location
Cervical/upper vs middle/lower	0.89 (0.51–1.54)	0.669
Tumor size
≤2 vs >2 cm	2.56 (1.59–4.13)	<0.05*
Differentiation
I + I–II vs II + II–III + III	2.85 (1.73–4.71)	<0.05*
Depth of invasion
m1 to m3 vs sm1 to sm3	8.09 (3.45–18.98)	<0.05*
Multicentric invasion
Absent vs present	2.78 (0.80–9.72)	0.109
Angiolymphatic invasion
Absent vs present	5.95 (2.81–12.57)	<0.05*

CI confidence interval, OR odds ratio

*Statistically significant