levels of evidence

Definition / meaning of levels of evidence

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 randomized double-blinded controlled clinical trial) and the endpoints measured (such as survival or quality of life) affect the strength of the evidence.

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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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