Читать книгу The Pocket Guide to Critical Appraisal - Iain K. Crombie - Страница 17

Some cohort studies identify the group from some time in the past and follow them up to the present. These studies might at first appear to be looking backwards in time, but they are not. Historical records are used, and time flows forwards from the point at which the individuals are identified. This type of design is usually called a retrospective cohort study. (Note the term historical cohort study is used when the exposed group is recruited from one period and the comparison group comes from an earlier period.)