Case-control study

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Term Case-control study
Description An inquiry in which groups of individuals are selected in terms of whether they do (the cases) or do not (the controls) have the disease of which the etiology is to be studied, and the groups are then compared with respect to existing or past characteristics judged to be of possible relevance to the etiology of the disease.
Definition Term (Heading format)

An inquiry in which groups of individuals are selected in terms of whether they do (the cases) or do not (the controls) have the disease of which the etiology is to be studied, and the groups are then compared with respect to existing or past characteristics judged to be of possible relevance to the etiology of the disease. A study in which the risk factors of people with a disease are compared with those without a disease. Case control studies select subjects based on their disease status. The study population is comprised of individuals that are disease positive, while the controls are disease negative. The case control study then looks back through time at potential exposures these populations may have encountered.

A study that compares exposures of people who have a disease or condition (cases) with people who do not have the disease or condition (controls). Exposures that are more common among the cases may be considered as possible risk factors for the disease.

References http://sra.org/resources_glossary_a-c.php

http://www.atsdr.cdc.gov/glossary.html#G-A-    

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