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Short Answer Questions for ED Fellowship Study

Case: Interpreting clinical research statistics

You are reading an article about a new anticoagulant for the management of atrial fibrillation.

1. Complete the table regarding the interpretation of measurements of central tendency. 6 marks

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2. Provide a definition for odds ratio. 1 mark

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3. Provide a definition for relative risk. 1 mark

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The results of the study describe a 10% relative risk reduction of stroke per year for the new drug in comparison with warfarin. The study reports a stroke risk of 5% per year for patients on warfarin.

4. In a population of 1000 patients with atrial fibrillation, provide the number of patients expected to suffer a stroke on each medication. 2 marks

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5. What is the absolute risk reduction of stroke in this cohort on the new drug? 1 mark

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6. What is the number needed to treat to prevent one stroke by using the new drug instead of warfarin? 1 mark

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This case forms part of a collaborative marking project designed to support fellowship preparation. In the week leading up to each tutorial, you can contribute answers to any active case. If you contribute, your answers may be reviewed, marked, and used to refine the model answers during the weekly fellowship teaching sessions.

All responses are displayed anonymously or using anonymised avatars. You remain in full control of your answers and may withdraw them at any time.

Your personal results and updated model answers become available the day after the tutorial.

After the tutorial you can still do the case and self-mark your answers, but your answers will not be included in the group review.