Narrative Review
Epidemiologic study designs: cohort studies
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Abstract
This paper is the second one of a series on “study designs” in which a review of cohort study design is presented. A cohort study is a nonexperimental or observational study. In a cohort study, a group of subjects (the cohort) is followed for a period of time and the participants do not have the outcome of interest in the beginning. These studies can be prospective or retrospective and the time between exposure and outcome must be well defined.
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