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 central square of each horizontal line represents the RR or WMD for each study. The lines demonstrate the range of the 95% CI. The vertical line at an RR of 1 or at WMD of 0 is the line of no effect. % Weight indicates the influence exerted by each study on the pooled RR or WMD. CI = confidence interval; M-H = Mantel-Haenszel; IV = inverse variance; SD = standard deviation.
