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Contents

Cohort Studies 

Chapter:
Study Design and Statistics
Author(s):

Margaret A. Winker

and Stephen J. Lurie

A prospective cohort study follows a group or of individuals who are initially free of the outcome of interest. Individuals in a cohort generally share some underlying characteristic, such as age, sex, or exposure to a . Some studies may comprise several different cohorts. The study is usually conducted for a predetermined period, long enough for some members of the cohort to develop the outcome of interest. Individuals who developed the outcome are compared with those who did not. The report of the study should include a description of the cohort and the length of follow-up, what were measured and

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