Evidence-Based Practice / Unit 6 EBP 0806 short lesson, about 20 seconds
Appraising a Case-Control Study
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The idea
Appraising a case-control study asks how cases and controls were selected, whether they are otherwise comparable, and how exposure information was obtained from both.
In practice
Controls drawn from the same population as the cases, exposure ascertained the same way.
Where people slip
If exposure was established by asking, recall bias is present and the appraisal should say so rather than hunt for it.
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