Table 1 Grade of recommendation
Level of evidence | Level of agreement between experts |
|---|---|
A meta-analyses, high quality systematic reviews, or randomized controlled trials | 2 general agreement between all experts |
B systematic reviews of case control or cohort studies | 1 discussed recommendation, but no formal objections between experts |
C non-analytic studies: for example, case reports, case series, small retrospective studies | 0 divergence of opinion |
D expert opinion |  |