Strength of recommendation |
A |
Strong evidence to support recommendation |
B |
Moderate evidence to support recommendation |
C |
Poor evidence to support recommendation |
|
Quality of evidence |
I |
Evidence of ≥1 randomized controlled clinical trial |
II |
Evidence of ≥1 well-designed clinical trial, not randomized, cohort or case–control studies (preferably more than one center), or multiple sets of results of uncontrolled studies |
III |
Evidence based on expert opinion or clinical experience, descriptive studies or committee reports |