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.
Mean load-to-failure for each of the four study groups. Error bars represent 95% confidence intervals of the estimated means. *Significantly different from intact control, P < 0.05. **Significantly different from straight-forward and significantly different from in-out-in, P < 0.05.
