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.
Between groups difference for pre and post-test differences of VAS-S (VAS-S, visual analogue scale for stress; VAT, vibroacoustic therapy; PLA, placebo).
| Group | Mean difference | Standard deviation | t | P |
| VAT | 1.765 | 1.792 | –0.019 | 0.985 |
| PLA | 1.775 | 1.958 |
