AM VaultPractice questions › Population health and ethics › Bias and confounding
Bias and confounding
A practice question in the style of the AMC Part 1 MCQ exam. Choose your answer to see the explanation.
Assessors who know which patients received surgery rate their recovery more highly. What bias is this?
Show the answer
The answer is C: Observer bias.
Knowing the allocation can affect outcome assessment.
You have answered 7 free questions. Keep going in the course: more than 3,000 exam-style questions in a six-month plan, with a short lesson each day and flashcards that come back when you need them. Week 1 is free.
This question comes from Week 24 of AM Vault: Evidence and epidemiology. That week has 156 more exam-style questions like it, 5 short lessons and 150 flashcards. The course starts free with Week 1 and reaches this topic in week 24, as part of a six-month plan with full mock exams along the way.
Start Week 1 freeTake the free readiness checkSpotted something wrong? Tell us.