Levels of Evidence

Select an evidence rating scale to display detailed information.

Strength-of-Recommendation Taxonomy (SORT)

Code Definition
A Consistent, good-quality patient-oriented evidence *
B Inconsistent or limited-quality patient-oriented evidence *
C Consensus, disease-oriented evidence *, usual practice, expert opinion, or case series for studies of diagnosis, treatment, prevention, or screening

* Patient-oriented evidence measures outcomes that matter to patients: morbidity, mortality, symptom improvement, cost reduction, and quality of life. Disease-oriented evidence measures immediate, physiologic, or surrogate end points that may or may not reflect improvements in patient outcomes (e.g. blood pressure, blood chemistry, physiologic function, pathologic findings).