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Cohort Study is an observational study in which a group of individuals â a cohort â are followed over a period of time in order to determine either the incidence rate of certain diseases or the risk factors that lead to those diseases. These studies can be either prospective or retrospective.
The methodological principles of cohort and case-. control studies are briefly outlined. For a more detailed account of design, conduct and analyses of epidemiological studies, the reader is. referred to textbooks and methodological articles given in the list of references. Cohort study.