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When Is Study Done?

Lead Author(s): Jeff Martin, MD

Prospective and Retrospective

Prospective and retrospective refer to when the study is done in relation to the study base experience (other epidemiologists refer to concurrent and non-concurrent).


  • Cohorts can also be retrospective. Looking back in time, a group of individuals is identified as a cohort (a typical example is a group of workers, such as shipyard workers in WWII) and then their disease experience over a period of time is investigated.
Topic revision: r3 - 02 Jun 2009 - 16:06:52 - MaryB?

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