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.
A Attribution proportion for each of the major
source groups for cases residing in different rurality zones over time. B The difference in attribution proportion by rurality with residents of major cities as the reference. Dots indicate posterior mean, while dark and faint lines indicate 80% and 95% credible intervals respectively. The dashed horizontal line indicates no difference
