Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Grading of the recommendations[1]
| Grading of the recommendations | |
| A | Recommendation supported by two or more levelItrials, without conflicting evidence from other levelItrials |
| B | Recommendation based on evidence from a single levelItrial OR, evidence from two or more levelItrials with conflicting, evidence from another levelItrial OR, evidence from two or more level IItrials |
| C | Recommendations based on levels of evidence III-V |
OR: Odds ratio.
