Which of the following has the levels of evidence in the correct order for the hierarchy of evidence pyramid (top to bottom)?
A) Expert opinion, case series, observational study, randomized controlled trial.
B) Observational study, non-randomized controlled trial, randomized controlled trial, systematic review.
C) Randomized controlled trial, non-randomized controlled trial, observational study, case series.
D) Systematic review randomized controlled trial, observational study, and expert opinion.

Question

Quizplus · Accepted Answer

This is the correct order of the hierarchy of evidence pyramid, with systematic reviews and meta-analyses at the top, followed by randomized controlled trials, observational studies, and case series/reports. Expert opinion is not considered a level of evidence and is not included in the hierarchy pyramid.

Which of the Following Has the Levels of Evidence in the Correct