Biostatistics & Research · single question
A study's results are skewed because participants were enrolled and retained in a non-representative way. This is an example of which bias?
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Correct answer: D. Selection bias
- A. Measurement (information) bias arises from how data are collected/recorded, not who is enrolled.
- B. Performance bias arises from differences in care/exposure between groups during the study.
- C. Reporting bias is selective disclosure of outcomes.
- D. Correct. Selection bias occurs when those included/retained are not representative of the target population (non-random sampling, poor exclusion criteria, loss to follow-up).
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