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.
GRADE quality ratings
| Quality | Meaning |
|---|---|
| Very low | True effect is probably markedly different from the estimated effect |
| Low | True effect might be markedly different from the estimated effect |
| Moderate | Authors believe that true effect is probably close to the estimated effect |
| High | Authors have a lot of confidence that the true effect is similar to the estimated effect |
Source:Guyatt et al. (2008).
