A study includes a control group, but participants are assigned to the intervention or control group according to the day they attend the clinic. What is the main limitation of this assignment method?
Correct answer: B. It may create unequal groups
- A. It prevents all data collection
- B. It may create unequal groups
- C. It guarantees selection bias is absent
- D. It makes the study purely qualitative
Explanation
Assignment by clinic day is not random and may place people with different characteristics into the two groups. Unequal groups can create confounding and reduce confidence that the intervention caused the outcome.
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