• James B Kirby, Gregg Taliaferro, and Samuel H Zuvekas.
• Center for Cost, Financing and Access Trends, Agency for Healthcare Research and Quality, Rockville, Maryland 20850, USA. jkirby@ahrq.gov
• Med Care. 2006 May 1; 44 (5 Suppl): I64-72.

ObjectivesThe substantial racial and ethnic disparities in access to and use of health services are well documented. A number of studies highlight factors such as health insurance coverage and socioeconomic differences that explain some of the differences between groups, but much remains unexplained. We build on this previous research by incorporating additional factors such as attitudes about health care and neighborhood characteristics, as well as separately analyzing different Hispanic subgroups.MethodsWe use the Oaxaca-Blinder regression-based method to decompose differences among racial and ethnic groups in 3 measures related to access, quantifying the portion explained by each of a number of underlying characteristics and the differences that remain unexplained. We use data from the 2000 and 2001 Medical Expenditure Panel Survey (MEPS), a nationally representative survey of the noninstitutionalized U.S. population. We link these data to detailed neighborhood characteristics from the Census Bureau and local provider supply data from the Health Services Resource Administration (HRSA).ResultsConsistent with earlier studies, we find insurance status and socioeconomic differences explain a significant part of the disparities. Additionally, neighborhood racial and ethnic composition account for a large portion of disparities in access, and language differences help explain observed disparities in the use-based access measure. However, much of the differences between racial and ethnic groups remain unexplained. We also found substantial variation in the level of disparities among different groups of Hispanics.ConclusionsResearchers and policymakers may need to broaden the scope of factors they consider as barriers to access if the goal of eliminating disparities in health care is to be achieved.

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