Table 3. Univariate and multivariate analysis of overall survival.

Variables	N	Univariate analysis			Multivariate analysis
		Hazard ratio (95% CI)	HR P value		Hazard ratio (95% CI)		HR P value
Age at diagnosis
≤65	30	1			1		–
>65	26	2.685 (1.052–6.853)	0.039		3.67 (1.259–10.701)		0.017
Size
≤3 cm	18	1	–		1		–
>3 cm	17	0.381 (0.077–1.889)	0.237		0.57 (0.132–2.467)		0.452
Unknown	21	1.392 (0.494–3.921)	0.532		1.72 (0.592–4.994)		0.319
Summary stage
Localized	18	1	–		1		–
Regional	19	0.476 (0.119–1.903)	0.294		0.688 (0.15–3.151)		0.63
Distant	8	0.877 (0.176–4.361)	0.872		1.249 (0.224–6.971)		0.8
Unknown	11	1.818 (0.585–5.644)	0.301		3.049 (0.897–10.359)		0.074
Surgery of primary site
No	14	1	–		–
Yes	42	0.642 (0.244–1.694)	0.371		0.791 (0.237–2.64)		0.703
Sex
Male	29	1	–		–
Female	27	1.04 (0.421–2.565)	0.933
Region
East	20	1	–		–
Northern Plain	3	0.548 (0.067–4.497)	0.575
Pacific Coast	32	0.868 (0.341–2.208)	0.766
Southwest	1	–	–
Race
White	35	1	–		–
Other	21	0.776 (0.324–1.86)	0.569
Primary site
Main bronchus	3	1	–		–
Upper lobe	24	1.34 (0.166–10.79)	0.783
Middle lobe	5	1.828 (0.188–17.77)	0.603
Lower lobe	19	1.276 (0.157–10.3)	0.819
Overlapping lesion	1	–	–
Lung, NOS	4	2.091 (0.187–23.47)	0.55
Radiation
No	43	1	–		–
Yes	13	0.963 (0.375–2.475)	0.938

CI, confidence interval.