Descriptive epidemiological studies attempt to identify the potential risk factors that lead to disease. Analytical studies try to determine which factors are actually relevant to disease development. Experimental studies are generally used to evaluate the effectiveness of a treatment or intervention in preventing disease.
■ On what three factors does a descriptive study focus?
■ What is the value of a double-blind experimental study?
■ Why is it important to include a placebo in a scientific study to assess the effectiveness of a drug?
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