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.
Quality of evidence and definitions.
| High quality | Further research is very unlikely to change the confidence in the estimate of effects |
| Moderate quality | Further research is likely to have an important impact on the confidence in the estimate of effect and may change the estimate |
| Low quality | Further research is very likely to have an important impact on the confidence in the effect and is likely to change the estimate |
| Very low quality | Any estimate of the effect is very uncertain |
