Table 1.

Characteristics of NHS-Medicare linked cohort in 2008^*.

Characteristic	NHS-Medicare linked 2008–2009
	N	%
Total	41,809
Age
65–69	9,492	22.70
70–74	11,481	27.46
75–79	9,752	23.33
80+	11,084	26.51
Race
White	40,574	97.05
Black	523	1.25
Asian/Pacific Islander	280	0.67
Other	432	1.03
Ethnicity
Hispanic	309	0.74
Zip level median household income (2010)
Mean	$65,060	-
Std Dev	$24,493	-
25%tile	$46,942	-
Median (IQR)	$59,710	-
75%tile	$77,283	-
Census Region
Midwest	6,702	16.03
Northeast	19,593	46.86
South	10,256	24.53
West	5,258	12.58
Total Cancer Cases from NHS Reference Standard**
Breast Cancer	2456	-
Colorectal Cancer	446	-
Lung Cancer	539	-

^*All female, Medicare FFS eligible since 07/01/2007 or earlier.

^**From algorithm version 4 (true positives plus false negative cases).