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Table 2 Description of Other Variables Used in the Analysis

From: Spatial analysis of elderly access to primary care services

Variable Description Source and level
Facilities and Utilization Data
BEDREHAB Number of beds in a PPS exempt rehabilitation unit of a hospital CMS Provider of Service (POS), ZIP code
VISITS Medicare Part B and outpatient primary care visits or ambulatory care visits, per Medicare Part B and outpatient beneficiary resident in the PCSA, plus number of primary care visits to rural health clinics or federally qualified health clinics per Medicare outpatient beneficiary resident in the PCSA CMS CECS DENOM & Part B & Outpatient, PCSA
Practitioner Data
TOTDOCS Count of clinically active specialists and primary care physicians per 1,000 population AMA/AOA Masterfiles, PCSA
ALT_DOC Ratio of the count of nonphysician clinicians to physicians, by state, 1995 Cooper et al, 1998b; state
IMG_RATIO Ratio of the count of international medical graduate physicians to clinically active specialists and primary care physicians AMA/AOA Masterfiles, PCSA
Market Conditions Data
MCPENE00 MMC PENETRATION of Medicare beneficiaries in 2000 CMS Geographic Service Area File, county
CINCREASE Binary indicator of an increase in competition among the MMC plans available, between 1998–2000, from inverse Herfindahl index CMS Geographic Service Area File, county
XHMO00 Penetration of state population by commercial HMOs, 2000 InterStudy, state
XHMODIF Change in penetration of state population by commercial HMOs, 1994 – 2000 InterStudy, state
XPPO00 Penetration of state population by commercial PPOs, 2000 InterStudy, state
XPPODIF Change in penetration of state population by commercial PPOs, 1994 – 2000 InterStudy, state
SHRLARG3(%) Percent market share of the largest three commercial group market insurers in 1997–2001 Academy for Health Services Research and Health Policy, state
ECOV97_9(%) Percent of elderly who have employer-sponsored health insurance American Association of Retired Persons (AARP), state
PRICE00A($) Annual premium for AARP's MediGap Plan A, 2000 RTI analysis of AARP MediGap premiums, state