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Cross-Sectional Studies and Case-Control

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The following is a case-control study: Obtaining histories and other information from a group of known cases and from a comparison group to determine the relative frequency of a characteristic or exposure under study.

Why is a study of the incidence of cancer in men who have quit smoking not an example of a case-control study???

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In this case the comparison of histories is confounding. We cannot classify the person with smoking and non-smoking history. He was a smoker so incidence of cancer ...

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