Instructions

) Matching is a useful way to control for confounding at the design level of which types of study designs? Cross-sectional Case-control Ecologic Case series Question 16 (5 points) In a case control study, which source of control is least likely to underestimate the measured association between exposure and disease? Hospital General population Family members Special groups Question 17 (5 points) 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.

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