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.
Graphical depiction of trends for outcomes, divided into pre- and post-implementation phases (vertical line). Main lines (continuing before and after implementation) depict overall trends for intervention sites (blue) and control sites (red boxes).
