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.
Zip code–level variables are binary variables, defined as higher than median vs lower than median. BMI indicates body mass index, calculated as weight in kilograms divided by height in meters squared; GI, gastrointestinal; GU, genitourinary; OR, odds ratio.
