Figure 4.
Meta-analysis results of mean pain index score.
Abbreviations: 95% CI, 95% confidence interval; df, degrees of freedom.
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.