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 segments represent the 95% CIs of each study. The diamonds represent the overall effect sizes, and the diamond widths represent the overall 95% CIs
