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.
Grades of Recommendation.
| A | Good evidence (Level I studies with consistent findings) for or against recommending intervention. |
| B | Fair evidence (Level II or III studies with consistent findings) for or against recommending intervention. |
| C | Conflicting or poor-quality evidence (Level IV or V studies) not allowing a recommendation for or against intervention. |
| I | There is insufficient evidence to make a recommendation. |
