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What are levels of evidence?

A hierarchy ranking study designs by susceptibility to bias, usually putting systematic reviews and meta-analyses at the top and expert opinion at the bottom. It is a useful starting point and it is not a substitute for appraisal, because a poorly conducted trial can be weaker than a well-conducted cohort study.

This comes up on Nursing Research and EBP Support, where it is answered in the context of the work itself.

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