A retrospective cohort study, also called a historic cohort study, is a longitudinal cohort study used in medical and psychological research. A cohort of individuals that share a common exposure factor is compared with another group of equivalent individuals not exposed to that factor, to determine the factor's influence on the incidence of a condition such as disease or death. Retrospective cohort studies have existed for approximately as long as prospective cohort studies.[1]
- ^ "What is epidemiology?" (PDF). 11 March 2019. Archived (PDF) from the original on 12 August 2017. Retrieved 29 August 2011.