Biostatistics & Research · single question
Which represents the BEST level of evidence among these choices?
Show answer and explanation
Correct answer: A. Randomized clinical trial
- A. Correct. Among the options, the RCT sits highest (systematic reviews/meta-analyses of RCTs would be higher but are not listed).
- B. Incorrect. Cohort (observational) studies rank below RCTs.
- C. Incorrect. Expert opinion is the LOWEST tier of evidence.
- D. Incorrect. Cross-sectional studies are observational/'snapshot' and rank below cohort and RCT designs.
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