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.
Level of evidence
| Rating | Strength of evidence |
|---|---|
| A | Results of a meta-analysis or multiple randomized controlled trials (RCTs) on humans. |
| B | Results of one VLU-related RCT in humans plus one or more similar historically controlled trials (HCT) or convenience controlled trials (CCT). May include two significant clinical series or expert opinion papers with literature reviews supporting the intervention. |
| C | Results of only one RCT, CCT, or HCT. May include multiple case series. |
