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USMLE · Question #559
USMLE Question #559: Real Exam Question with Answer & Explanation
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Question
A randomized controlled trial is conducted to assess the risk for development of gastrointestinal adverse effects using azithromycin compared with erythromycin in the treatment of pertussis in children. Of the 100 children with pertussis enrolled 50 receive azithromycin, and 50 receive erythromycin. Results show vomiting among 5 patients in the azithromycin group, compared with 15 patients in the erythromycin group. Which of the following best represents the absolute risk reduction for vomiting among patients in the azithromycin group?
Options
- A0.1
- B0.2
- C0.33
- D0.67
- E0.8
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