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.
ROP incidence increased in all MHI quartiles between 2003 and 2019, disproportionately affecting those born to parents residing in the lowest income quartile areas.
