HMO data systems in population studies of access to care.
OBJECTIVE
A review of the current status of HMO data sets and their applicability to population studies of access to care.


METHODS
Publications and reports based on research among different models of HMOs; reviews of HMO quality of care by national organizations; and HMO industry profiles.


METHODS
Design was a literature review of the content of HMO data sets: completeness of reporting, processing, and reporting.


METHODS
Publications and publicly available reports were reviewed.


RESULTS
Most HMOs are able to aggregate the number of services provided but demonstrate little ability to provide patient profiles. While their content is limited, HMO data sets are significant improvements over indemnity plan data, and where available, their accuracy in measuring health services utilization is superior to that of surveys. There are important differences among HMO delivery systems in their ability to provide useful data for population studies.


CONCLUSIONS
A valuable resource, HMO data are limited by their content and the relative inaccessibility to IPAC-HMO information. This could be improved through new financial and technical support to HMOs interested in research.
Graduate School of Health Science, New York Medical College, Valhalla 10595, USA.
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D018672:Community Health Planning; D016208:Databases, Factual; D019538:Health Care Surveys; D006279:Health Maintenance Organizations / Q000458:organization & administration* / Q000706:statistics & numerical data; D006297:Health Services Accessibility / Q000706:statistics & numerical data*; D006801:Humans; D007256:Information Systems; D011159:Population Surveillance / Q000379:methods*; D011787:Quality of Health Care; D018570:Risk Assessment; D014481:United States