Over the past 3 decades, the traditional view that which type of study is a backward cohort study has been supplanted by a modern view that asserts that it is merely an efficient way to learn more about the relationship between exposure and a disease

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The retrospective cohort study  is the branch of backward cohort study supplanted by modern view that asserts that it is merely an efficient way to learn more about the relationship between exposure and a disease

Which is a retrospective cohort study?

Because the word "Retrospective” means relating to the past, this study is carried out by scientists who identify a group of people for study and plan the research in advance while collecting data over time.

Hence, the retrospective cohort study  is the branch of backward cohort study supplanted by modern view.

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