Figure 1.
Relationships between risk factors and degree of H–B grade improvement. degree of H–B grade improvement—initial H–B grade–final H–B grade.
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.