Table 2.

Stratified Comparisons of Median Lung Cancer-Specific Survival Time to Lymph Node Ratio Group

Characteristic	Lymph Node Ratio			P-value
	≤0.15	0.16-0.50	≥0.5
	Median Lung Cancer-Specific Survival (years)
Age, years
≤50	10.08	4.08	3.00	<0.0001
51-60	7.25	4.33	2.75	<0.0001
≥60	5.50	4.33	2.25	<0.0001
Female	7.50	4.75	2.83	<0.0001
Race/Ethnicity
White	7.08	4.33	2.50	<0.0001
African American	5.58	4.17	2.92	0.01
Hispanic		3.58	3.42	0.15
Other	7.58	4.92	2.92	0.005
Married	7.25	4.50	2.67	<0.0001
Histology
Adenocarcinoma	5.75	4.17	2.58	<0.0001
Squamous cell carcinoma	11.00	4.67	2.42	<0.0001
Large cell carcinoma	3.17	2.42	2.50	0.73
Bronchioalveolar cell carcinoma	11.17	3.92	3.58	0.07
Other	7.33	5.00	2.67	<0.0001
Tumor Location
Upper lobe	9.25	5.25	2.67	<0.0001
Middle lobe	10.08	4.92	4.25	0.13
Lower lobe	5.75	3.58	2.17	<0.0001
Other location	5.00	3.33	2.92	0.47
Tumor Status
T1A		6.75	4.42	<0.0001
T1B	5.58	5.17	3.33	0.001
T2	8.00	5.75	2.42	<0.0001
T2A	13.33	4.33	2.58	<0.0001
T2B	5.92	2.50	2.25	0.001
T3	4.58	2.92	1.75	<0.0001
Type of Surgery
Lobectomy	8.00	4.50	2.83	<0.0001
Pneumonectomy	5.17	3.58	1.75	<0.0001
Postoperative Radiation Therapy
Yes	7.00	4.08	2.50	<0.0001
No	7.17	4.58	2.75	<0.0001