Table 4. Multivariate analysis of the factors affecting survival.

Variables	DFS			OS
	P value	95% CI		P value	95% CI
Tumor size	0.336	0.68–3.12		0.009	1.93–11.5
TNM stage	0.007	1.31–5.39		0.415	0.59–3.56
Tumor differentiation	<0.001	2.34–7.10		<0.001	2.28–10.7
Bronchial involvement	0.004	0.22–0.75		0.178	0.26–1.29
Lymphovascular invasion	0.091	0.20–1.12		0.010	0.12–0.75
Micropapillary pattern	0.001	1.49–4.91		0.056	0.98–4.84

DFS, disease-free survival; OS, overall survival; CI, confidence interval.