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Case-control study

An observational analytic study that enrols one group of persons with a certain disease, chronic condition, or type of injury (case-patients) and a group of persons without the health problem (control subjects) and compares differences in exposures, behaviours, and other characteristics to identify and quantify associations, test hypotheses, and identify causes.
(Principles of Epidemiology in Public Health Practice, 3rd Ed. US Department of Health and Human Services, Centers for Disease Control and Prevention).

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