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.
Square data markers represent odds ratios; horizontal lines, the 95% CIs, with marker size reflecting the statistical weight of the study using random-effects meta-analysis. The diamond data marker represents the overall odds ratio and 95% CI for the outcome of interest. Evaluated using the random-effects Mantel-Haenszel test.
