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.
Domains used to assess strength of evidence
| Risk of bias: Reflects issues in study design and conduct that could result in biased estimates of effect |
| Consistency: Reflects similarity of effect sizes seen across studies. Consistency cannot be assessed when only one study is available |
| Directness: Reflects the relationship between the intervention and the ultimate health outcome of interest |
| Precision: Reflects the level of certainty around the effect observed |
