Levels of Evidence

Explanation of the 2011 OCEBM Levels of Evidence

This document explains the background to the Oxford Centre for Evidence Based Medicine’s Levels of Evidence.

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Levels of Evidence: Introductory Document

This must be read before using the Levels: no evidence ranking system or decision tool can be used without a healthy dose of judgment and thought.

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Oxford Centre for Evidence-based Medicine - Levels of Evidence (March 2009)

This is the first version of the Levels of Evidence, last revised in March 2009

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