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)
Grading of Recommendations Assessment, Development and Evaluation (GRADE)
Code | Quality of Evidence | Definition |
---|---|---|
A | High |
Further research is very unlikely to change our confidence in the estimate of effect.
|
B | Moderate |
Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate.
|
C | Low |
Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate.
|
D | Very Low |
Any estimate of effect is very uncertain.
|
Source: GRADE (Grading of Recommendations Assessment, Development and Evaluation) Working Group 2007 1 (modified by the EBM Guidelines Editorial Team)