Fig. 7.
Forest for fracture toughness according to the meta-analysis (SD, standard deviation; CI, confidence interval; SMD, standardized mean difference).
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.