Table 5.

Multivariate analysis of the risk factors for development of model

Variables	β	OR (95% CI)	P value
Differentiation
I VS II + III	1.368	3.93 (1.57–9.83)	0.003*
Tumor size
≤ 2.65 cm vs >2.65 cm	1.188	3.28 (1.79–6.01)	<0.001*
Bronchus invasion
Absent vs Present	0.876	2.40 (1.13–5.13)	0.023*
Intercept	−2.947

^* P < 0.05