Levels of evidence

Levels of evidence

In evidence-based medicine, levels of evidence is a ranking system used to describe the strength of the results measured in a clinical trial or research study. The design of the study (such as a case report for an individual patient or a double-blinded randomized controlled trial) and the endpoints measured (such as survival or quality of life) affect the strength of the evidence.

External links

* [http://www.cancer.gov/Templates/db_alpha.aspx?CdrID=446533 Levels of evidence] entry in the public domain NCI Dictionary of Cancer Terms
* [http://www.jr2.ox.ac.uk/bandolier/booth/diagnos/Diagessy.html Evidence and diagnostics]
* [http://www.dartmouth.edu/~biomed/resources.htmld/guides/ebm_resources.shtml EBM resources page] , with a diagram showing different levels of evidence forming a pyramid


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