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.
Forest plots show squares representing the odds ratio for the experimental group compared with the placebo control group. Size of the squares is proportional to the size of the trials, and error bars represent the 95% confidence interval, with the diamond-shaped object representing the pooled estimates within each analysis.
