HW 4 - Sojung Suk N50 Dr. Carpenter, Catherine Chapter 10...

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Sojung Suk N50 Dr. Carpenter, Catherine Chapter 10 1. The best answer is c. incident rates may be computed directly Rationale: page 179 –case study begins with people with the disease (case) and compares them to people without disease (controls)…. .page 180 –the problem with use of incident cases is that we must often wait for new cases to be diagnosed… Despite this practical advantage of using prevalent cases, however, it is generally preferable to use incident cases of the disease in case-control studies of disease etiology. 2. The best answer is a. Cross-sectional study Rationale: page 195 –in a cross-sectional study, both exposure and disease outcome are determined simultaneously for each subject; it is as if we were viewing a snapshot of the population at a certain point in time…in this type of approach, the cases of disease that we identify are prevalent cases of the disease in question, because we know that they existed at the time of the study but do not know their duration. For this reason, this design is also called a prevalence study.
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This note was uploaded on 08/12/2010 for the course SON N50 taught by Professor Carpenter during the Summer '09 term at UCLA.

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HW 4 - Sojung Suk N50 Dr. Carpenter, Catherine Chapter 10...

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