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.
The summary of the risk of bias analysis. Each bar chart corresponds to one criteria of bias, stacked along the Y axis. The X axis quantifies the percentage of the studies with the corresponding color-coded subjective assessment as explained in the legend.
