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.
SMD indicates standardized mean difference. The squares indicate the SMDs, the horizontal lines the 95% CIs, and the diamond the overall result.
