Question 5 / 8:  What challenges does measurement of the exposure in a case-control study present?
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Case-control studies, being retrospective require that the exposure is measured retrospectively. Sometimes it is difficult to get good quality data on the exposure.
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Epidemiology & Biostatistics Case-control Studies

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Attribution:  Janet, E.A. Forrester, Kwan Ho Kenneth Chui, Steven Cohen, Michael D. Kneeland, Alice Tang, David Tybor. Epidemiology and Biostatistics 2010. (Tufts University OpenCourseWare), http://ocw.tufts.edu/Course/65/ (Accessed 3 May, 2014). License: Creative Commons BY-NC-SA
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