Table 1.

Linked Analytic Dataset (N=93,332)

Analytic Level	Identifier	Data Source	Data Files	Variables
I (Patient)	Unique Patient Identifier	NCI	SEER	Tumor site and extent
				Tumor directed treatment
		SEER-Medicare		Year of diagnosis
				Marital status
				Census tract of residence
				ZIP code of residence
I (Patients)	Unique Patient Identifier	CMS	Medicare Claims	Medicare entitlement type and duration
		SEER-Medicare		HMO membership
				Age
				Sex
				Race
				Poverty indicator
				Comorbidity
				Tumor directed treatment
				Post-tx tumor surveillance
				Survival at five years post-dx
II (Neighborhood)	Unique ZCTA	US Census	Census 2000	% College Educated
			Summary File 3	% Black
				Socioeconomic Disadvantage Score [1]
				Ethnic Isolation Score [2]
III (Medical Market)	Unique HSA		Various
		AMA		# medical oncologists/capita
				# surgeons/capita
				# radiation oncologists/capita
				# cancer screening physicians/capita
				# gastroenterologists/capita
		FDA		# mammography facilities/capita
		AHA		# acute care beds/capita
				# JCAHO accredited hospitals/capita

Legend: NCI=National Cancer Institute; SEER=Surveillance Epidemiology and End Results; CMS Centers for Medicare and Medicaid Services; ICD =International Diagnostic Code; HCPC=Health Care Financing Administration Common Procedure Codes; CPT=Common Procedure Terminally; HMO= health maintenance organization; ZCTA= ZIP Code Tabulation Area; AHA= American Hospital Association; AMA=American Medical Association; FDA = Food and Drug Administration; HAS = hospital service area; JCAHO=Joint Committee on Accreditation of Health Care Organizations; Tx= treatment; Dx= diagnosis