American Journal of Epidemiology Vol. 140, No. 7: 643-648
Copyright © 1994 by The Johns Hopkins University School of Hygiene and Public Health
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Comparison of Control Subjects Recruited by Random Digit Dialing and Area Survey
1Department of Epidemiology and Biostatistics, School of Medicine, University of California San Francisco, CA
2Department of Health Research and Policy, School of Medicine, Stanford University Stanford, CA
3Department of Epidemiology, School of Public Health and Community Medicine, University of Washington Seattle, WA
4Program in Epidemiology, Fred Hutchinson Cancer Research Center Seattle, WA
Although random digit dialing (RDD) is an accepted and commonly used method of sampling populations for controls in case-control studies, there have been surprisingly few attempts to compare the accuracy of RDD with that of the best traditional alternative, i.e., household area surveys. The aim of the present study was to compare a variety of characteristics of control subjects selected by ROD and area survey methods. All data were gathered through in-person interviews of both types of control subjects. The area survey identified a population-based sample of 20- to 79-year-old residents of two Washington State counties in 1978 and 1979. Control groups for three case-control studies of bladder cancer, gynecologic cancers, and multiple myeloma were drawn from this area sample, for a total of 240 control subjects. Controls aged 21-64 years from the same counties were identified for the National Bladder Cancer Study using ROD telephone sampling during the same time period. There were 134 respondents in the ADD control group. Overall, the two control groups selected by these two different methods yielded similar estimated frequencies of various population characteristics. The small differences observed in some age/sex subgroups and the statistical significance of the overall measure of association for occupational exposure to organic substances may be attributed to multiple compar isons.
case-control studies; data collection; epidemiologic methods
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