Grading of recommendations
| Grade . | Recommendation . |
|---|---|
| A (Evidence-level quality Ia, Ib) | Requires at least 1 randomized controlled trial as part of the body of literature of overall good, and consistency addressing the specific recommendation |
| B (Evidence levels IIa, IIb, III) | Requires availability of well-conducted clinical studies but no randomized clinical trials on the topic of recommendation |
| C (Evidence level IV) | Requires evidence from expert committee reports or opinions and/or clinical experience of respected authorities; indicates absence of directly applicable studies of good quality |
| Grade . | Recommendation . |
|---|---|
| A (Evidence-level quality Ia, Ib) | Requires at least 1 randomized controlled trial as part of the body of literature of overall good, and consistency addressing the specific recommendation |
| B (Evidence levels IIa, IIb, III) | Requires availability of well-conducted clinical studies but no randomized clinical trials on the topic of recommendation |
| C (Evidence level IV) | Requires evidence from expert committee reports or opinions and/or clinical experience of respected authorities; indicates absence of directly applicable studies of good quality |