Table 1. Baseline patient characteristics of the early stage lung cancer SEER-Medicare cohort (N=42,910).

Patient Characteristics	Total Patients N	Prior Malignancy N (%)	P-Value	Adjusted P-Valuea
All Patients
	42 910	8966 (20.9)
Age			<0.001	0.902
Age<75	20 780	3922 (18.9)
75<=Age<85	18 779	4263 (22.7)
Age>=85	3351	781 (23.3)
Sex			<0.001	0.923
Female	20 622	3847 (18.7)
Male	22 288	5119 (23)
Race/Ethnicity			<0.001	0.962
White	37 918	8020 (21.2)
Black	2888	614 (21.3)
Hispanic	1730	270 (15.6)
Other	374	62 (16.6)
Marriage Status			<0.001	0.938
Married	23 202	5090 (21.9)
Sep/Div/Widb	15 675	3070 (19.6)
Single	2690	526 (19.6)
Unknown	1,343	280 (20.8)
Histology			<0.001	0.901
Adenocarcinoma	19 891	4574 (23.0)
Squamous	13 176	2595 (19.7)
Small cell	1576	264 (16.8)
NSCLCc	8267	1533 (18.5)
Charlson Comorbidity			<0.001	0.934
0	16 798	3834 (22.6)
1	13 322	2649 (19.9)
2+	11 089	2224 (20.1)
Not available	1521	259 (17.0)
Medicaid			<0.001	0. 692
Yes	6378	994 (15.6)
No	36 532	7972 (21.8)
Treatment			0.3390	0. 986
Surgery only	20 009	4070 (20.3)
Chemotherapy only	923	235 (25.5)
Radiation only	5475	1166 (21.3)
⩾2 treatments	8589	1935 (22.5)
No Surg/Chemo/Radd	7914	1560 (19.7)
Cause of deathe			<0.001
Alive	17 254	3763 (21.8)
Lung cancer specific	16 103	2719 (16.9)
All other causes	9553	2484 (26.0)

^aPropensity Score Adjusted P-value: non-significance denotes groups are well balanced for covariates of interest.

^bSeparated/Divorced/Widowed.

^cNon-small cell lung carcinoma.

^dNo surgery/chemotherapy/radiation.

^eDependent variable, no adjusted P-value necessary.