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.
Calculated group size required to achieve a statistically significant result based on different effect sizes. (A) Group sizes required to achieve significance for 2‐hour pain freedom. (B) Group sizes required to achieve a significance for 2‐hour MBS freedom. Calculations are powered at 80%. Bars at the top represent the range of observed effect sizes in currently reported studies.
