Table 3. Univariate analysis of the factors affecting survival.

Variables	DFS			OS
	P value	95% CI		P value	95% CI
Gender	0.085	0.34–1.07		0.121	0.25–1.18
Age	0.284	0.99–1.05		0.161	0.99–1.08
Smoking cigarette	0.029	0.30–0.94		0.241	0.37–1.27
Family cancer history	0.860	0.50–1.79		0.606	0.59–2.45
Tumor size	<0.001	2.03–7.82		<0.001	4.09–222
TNM stage	<0.001	1.98–7.32		0.004	1.37–7.65
Tumor differentiation	<0.001	2.43–6.33		<0.001	2.51–9.45
Visceral invasion	0.091	0.28–1.13		0.639	0.35–1.93
Bronchial involvement	<0.001	0.12–0.38		<0.001	0.09–0.39
Lymphovascular invasion	0.021	0.13–0.74		0.001	0.07–0.41
Postoperative adjuvant chemotherapy	0.365	0.43–1.35		0.969	0.46–2.12
Pathological subtype	0.041	1.01–1.74		0.100	0.94–1.96
Micropapillary pattern	<0.001	2.07–6.45		0.003	1.52–6.87

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