A retrospective cohort study, also called a historic cohort study, (from Latin retr, "look back") generally means to take a look back at events that already have taken place. For example, the term is used in medicine, describing a look back at a patient's medical history or lifestyle. Retrospective cohort studies have existed for approximately as long as prospective cohort studies.
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Famous quotes containing the words cohort and/or study:
“The cohort that made up the population boom is now grown up; many are in fact middle- aged. They are one reason for the enormous current interest in such topics as child rearing and families. The articulate and highly educated children of the baby boom form a huge, literate market for books on various issues in parenting and child rearing, and, as time goes on, adult development, divorce, midlife crisis, old age, and of course, death.”
—Joseph Featherstone (20th century)
“The life of a good man will hardly improve us more than the life of a freebooter, for the inevitable laws appear as plainly in the infringement as in the observance, and our lives are sustained by a nearly equal expense of virtue of some kind. The decaying tree, while yet it lives, demands sun, wind, and rain no less than the green one. It secretes sap and performs the functions of health. If we choose, we may study the alburnum only. The gnarled stump has as tender a bud as the sapling.”
—Henry David Thoreau (1817–1862)