1. Validity of random-digit-dialing in recruiting controls in a case-control study.
- Author
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Wang PP, Dicks E, Gong X, Buehler S, Zhao J, Squires J, Younghusband B, McLaughlin JR, and Parfrey PS
- 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. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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