A Study to Assess Spironolactone's Efficacy in Patients with Heart

question 90

Multiple Choice

A study to assess spironolactone's efficacy in patients with heart failure is performed.  450 patients receive either spironolactone or placebo for two years.  Neither the patients nor physicians are aware of who takes the drug or placebo.  The study setup described above is most effective in preventing:

• A)Beta error
• B)Recall bias
• C)Observer bias
• D)Effect modification
• E)Selection bias

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