MedicalTerminology DB
Clinical Research & Statistics

levels of evidence

Meaning of levels of evidence: A ranking system used to describe the strength of the results measured in a clinical trial or research study.

Definition 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.

Written and maintained by James Murray Last updated July 21, 2026 Educational reference, not medical advice. Read the limitations.

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