Card 8 / 14: Epidemiologic studies examining exposure-disease relationships may be observational or interventional. What is the essential difference between an interventional and an observational study design?
Answer:
In an interventional study design the investigator intervenes to assign an exposure to a study volunteer, such a treatment or procedure (by random or nonrandom assignment) whereas in an observational study, the investigator merely observes the exposure as it occurs in the volunteer without intervening.
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Descriptive Epidemiology Incidence Prevalence
Author:
Dr.Janet ForresterProfessor
Tufts University School of Medicine
USA
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