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.
Expected/observed number of links between race/ethnicities (African American, Asian, Latino, and white) in each of the three metropolitan areas. Lines between race/ethnic groups indicate whether the numbers observed are lower than expected, as expected, or higher than expected (p < .01). Detailed distributions are available in Supplementary Figures S3–S5. Color images are available online.
