Case control study.

A case-control study is a type of observational research design used in epidemiology and other fields of science to investigate the association between an outcome (usually a disease or health condition) and potential risk factors or exposures. The primary objective of a case-control study is to compare the exposure history of individuals with the outcome of interest (cases) to individuals without the outcome (controls). This comparison helps researchers identify potential associations or factors that _______ _______ ____ ____ _________ ____ ___ _______ _____ _______ __________.
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