Figure 2.
Workflow of the meta-analysis. (a) Literature screening and search process; (b) extracting relevant data from the literature; (c) calculating the ES and 95% confidence interval (CI); (d) result.
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.