Grades of recommendation
| Level of evidence . | Level of agreement between experts . |
|---|---|
| (A) Meta-analyses, high-quality systematic reviews, or randomized controlled trials | (2) 100% agreement between all experts |
| (B) Systematic reviews of case control or cohort studies | (1) ≥80% agreement between all experts |
| (C) Nonanalytic studies such as case reports, case series, and small retrospective studies | (0) Divergence of opinion (<80% agreement between all experts) |
| (D) Expert opinion |
| Level of evidence . | Level of agreement between experts . |
|---|---|
| (A) Meta-analyses, high-quality systematic reviews, or randomized controlled trials | (2) 100% agreement between all experts |
| (B) Systematic reviews of case control or cohort studies | (1) ≥80% agreement between all experts |
| (C) Nonanalytic studies such as case reports, case series, and small retrospective studies | (0) Divergence of opinion (<80% agreement between all experts) |
| (D) Expert opinion |