Validity of Random-Digit-Dialing in Recruiting Controls in a Case-Control Study

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Abstract:

Objectives : To evaluate whether the participating controls represented the underlying population in a colorectal cancer case-control study in a geographically isolated North American population.

Methods : The characteristics of the study controls recruited through Random-digit-dialing (RDD) were compared with those in the corresponding target population estimates.

Results : Participating controls were more likely to have higher levels of education and income and were less likely to be smokers.

Conclusion : Study controls recruited through RDD tend to have higher socioeconomic status, which may lead to overestimation of a number of risk factors in this study.

Keywords: Newfoundland; case-control study; random-digit-dialing

Document Type: Research Article

DOI: http://dx.doi.org/10.5993/AJHB.33.5.4

Affiliations: 1 Associate Professor, Epidemiology, Division of Community Health and Humanities, Faculty of Medicine, Memorial University of Newfoundland, St. John's, NL, Canada.

Publication date: September 1, 2009

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  • The American Journal of Health Behavior seeks to improve the quality of life through multidisciplinary health efforts in fostering a better understanding of the multidimensional nature of both individuals and social systems as they relate to health behaviors.

    The Journal aims to provide a comprehensive understanding of the impact of personal attributes, personality characteristics, behavior patterns, social structure, and processes on health maintenance, health restoration, and health improvement; to disseminate knowledge of holistic, multidisciplinary approaches to designing and implementing effective health programs; and to showcase health behavior analysis skills that have been proven to affect health improvement and recovery.

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