Which of the following statements is false? a. Cohort study can have more than one comparison group to be compared to the exposed group. b. Investigators in a retrospective cohort study can usually obtain more detailed information on exposures and other key variables because they have more control of the data collection process and can gather information directly from the participants. c. The timing of prospective cohort studies is similar to that of experimental studies. d. Observational studies are considered “natural” experiments because the investigator acts as a disinterested observer, merely letting nature take its course.
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Step 1: Cohort studies involve identifying subjects at a point in time when they do not have the outcome of interest and comparing the incidents of the outcome among groups of exposed and unexposed subjects. Show more…
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In a retrospective cohort study, which of the following is true? An historical cohort is reconstructed by the investigator with data on the predictor variable (measured in the past) and data on the outcome collected (measured in the past after some follow-up period). A cohort is identified by the investigator with data on the predictor variable (measured in the past) and the cohort is then followed to identify the outcome. The outcome variable is measured by the investigator at the start of the study. A cohort of data is followed, with analyses occurring after all the data have been collected. Restriction is commonly used in cohort studies for what purpose? To improve the feasibility of the study To improve the focus of the study To lower the risk of bias
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