Table 4.

Multivariate analysis of the risk factors for lymph node metastases

Variables	β	OR (95% CI)	P value
Differentiation
I VS II + III	1.291	3.64 (1.44–9.16)	0.006*
Tumor size
≤ 2.65 cm vs >2.65 cm	1.171	3.23 (1.75–5.93)	<0.001*
Pleura invasion
Absent vs Present	0.496	1.64 (0.84–3.21)	0.146
Bronchus invasion
Absent vs Present	0.931	2.54 (1.18–5.46)	0.017*
Intercept	−3.013

^* P < 0.05