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.
Boldface and italicized text represent primary characteristics, factors and analytical analyses used in this adaptation of the Andersen model. Source: Adapted from Andersen and Davidson, 1997
