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.
Boxes indicate mean values, with larger boxes indicating greater weight; whiskers represent 95% CIs; and the diamond indicates the pooled mean value with the tips of the diamond representing the 95% CI of the pooled mean.
