Levels of Evidence
Select an evidence rating scale to display detailed information.
- Centre for Evidence-Based Medicine, Oxford (1a-5)
- SORT: Strength-of-Recommendation Taxonomy (A,B,C)
- GRADE: Grading of Recommendations Assessment, Development and Evaluation (A,B,C,D)
- Practice Guidelines rating scales (various)
Strength-of-Recommendation Taxonomy (SORT)
|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).