Cohort study

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Term Cohort study
Description An epidemiologic study that observes subjects in differently exposed groups and compares the incidence of symptoms.
Definition An epidemiologic study that observes subjects in differently exposed groups and

compares the incidence of symptoms. Although ordinarily prospective in nature, such a study is sometimes carried out retrospectively, using historical data. See prospective study. Prospective study - аn inquiry in which groups of individuals are selected in terms of whether they are or are not exposed to certain factors, and then followed over time to determine differences in the rate at which disease develops in relation to exposure to the factor. Also called cohort study.

References http://www.epa.gov/iris/help_gloss.htm#a

http://sra.org/resources_glossary_p-r.php    

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