Table 3.

Univariate analysis of the risk factors for lymph node metastases

Variables	OR (95% CI)	P value
Age
≤ 60 vs >60	0.75 (0.44–1.30)	0.304
Gender
male vs female	1.0 (0.58–1.72)	0.997
Pathology
Squamous cell carcinoma VS Adenocarcinoma	0.60 (0.28–1.27)	0.179
Tumor location
Right lobes vs Left lobes	1.00 (0.57–1.77)	0.98
Upper lobes vs Middle +Left lobes	1.45 (0.82–2.56)	0.199
Single lobes vs Mixed lobes	1.12 (0.39–3.24)	0.832
Differentiation
I VS II + III	6.22 (2.58–15.03)	<0.001*
Tumor size
≤ 2.65 cm vs >2.65 cm	4.62 (2.59–8.24)	<0.001*
Pleura invasion
Absent vs Present	1.93 (1.05–3.54)	0.034*
Bronchus invasion
Absent vs Present	3.64 (1.78–7.44)	<0.001*
Multicentric invasion
Absent vs Present	1.04 (0.36–2.98)	0.939
Angiolymphatic invasion
Absent vs Present	2.14 (0.59–7.83)	0.249

^* P < 0.05