Table 1. Characteristics of Study Population by Patient Race^a.

Characteristicb	White(n = 2,506)	African American (n = 550)	p Value
Age (y)	68.3 + 9.6	66.3 + 11.0	0.0001
Age(y)			<0.0001
<50	3.6	7.3
50–59	13.9	20.8
60–69	33.6	29.5
70–79	38.4	30.9
≥80	10.5	11.5
Sex			<0.0001
Male	58.1	66.9
Female	41.9	33.1
Marital status [n = 159]			<0.0001
Married	64.7	45.6
Single	4.1	16.2
Separated or divorced	9.8	15.6
Widowed	21.4	22.6
Romano-Charlson comorbidity index [n = 284]			0.876
0	46.1	47.1
1	34.5	33.3
2+	19.4	19.6
Residency [n = 194]			0.0005
Urban	72.4	64.8
Rural	27.6	35.2
Education, zip code level [n = 265]			<0.0001
High education	70.4	60.4
Low education	29.6	39.6
Income, zip code level [n = 265]			<0.0001
Not living in poverty	89.5	68.7
Living in poverty	10.5	31.3
Insurance status [n = 203]			<0.0001
Commercial	19.9	15.7
HMO	2.3	3.7
Medicare	70.3	63.6
Medicaid	2.4	7.2
Other	1.6	1.8
Self-pay	3.5	8.0
Year of diagnosis			0.660
1996	15.1	12.4
1997	13.0	13.1
1998	14.3	15.3
1999	13.7	15.6
2000	15.0	14.7
2001	14.9	14.2
2002	14.0	14.7
Tumor location			0.258
Main bronchus	2.9	2.7
Upper lobe	58.3	59.5
Middle lobe	5.4	6.0
Lower lobe	28.4	24.7
Overlapping lesion	1.3	2.0
NOS	3.7	5.1

^aValues are reported as percentages, except for age, which is reported as mean ± standard deviation.

^bNumbers given in brackets indicate number of patients with missing data.

HMO = health maintenance organization; NOS = not otherwise specified.