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a Department of Epidemiology and Biostatistics, Boston University School of Public Health, MA
b Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, Baltimore
c School of Social Work and the Program on Aging, Disablement and Long-Term Care, Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill
Correspondence: Lisa Fredman, PhD, Department of Epidemiology and Biostatistics, Boston University School of Public Health, 715 Albany Street, Boston, MA 02118. E-mail: lfredman{at}bu.edu.
Laurence G. Branch, PhD
Purpose: Public-use datasets can extend data collected by individual investigators in various ways: making external comparisons, providing additional data on individual respondents, and creating internal comparison groups. The authors describe the advantages and limitations of these methods and practical and conceptual issues in combining investigator-initiated and public-use datasets. Design and Methods: These issues are illustrated with a study of functional decline among 674 patients following hospitalization for hip fracture that was augmented with data from a public-use dataset, the Established Populations for Epidemiologic Studies of the Elderly (EPESE). Results:By creating an internal comparison group of EPESE respondents, frequency matched to hip fracture patients on age, sex, and baseline functional limitations, the authors formed a single dataset and performed multivariable analyses of factors associated with functional decline. Implications: Gerontological research may benefit by applying these methods to program evaluations and longitudinal analyses of health outcomes with numerous public-use datasets.
Key Words: Data linkage EPESE Hip fracture Physical functioning
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