Fig. 6.
Effective sample size (ESS) funnel plots and the associated regression test of asymmetry, as reported by Deeks et al. A p value < 0.10 was considered evidence of asymmetry and potential publication bias.
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.