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Which of the following statements is untrue about case-control studies?

A. Exposure to a factor is determined retrospectively.
B. They are a type of longitudinal design.
C. The measure of association is the odds ratio.
D. Exposure levels may be difficult to quantify precisely.
E. They can examine many potential exposures.

Answer :

Final answer:

In a case-control study, exposure is determined retrospectively and the measure of association is the odds ratio. They can examine many potential exposures. They are not a type of longitudinal design.

Explanation:

In a case-control study, exposure to a factor is determined retrospectively (option A) rather than prospectively. Case-control studies are not a type of longitudinal design (option B) as they are typically cross-sectional in nature. The measure of association in case-control studies is the odds ratio (option C). Exposure levels may indeed be difficult to quantify precisely (option D). Case-control studies are designed to examine many potential exposures (option E) in order to establish associations with diseases.

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