What is "quality of evidence" and why is it important to clinicians?

Guyatt, Gordon H; Oxman, Andrew D; Kunz, Regina; Vist, Gunn E; Falck-Ytter, Yngve; Schünemann, Holger J; GRADE Working Group · BMJ · 2008

review · Level V

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Abstract

Guideline developers use a bewildering variety of systems to rate the quality of the evidence underlying their recommendations. Some are facile, some confused, and others sophisticated but complex

Medical subject headings