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.
False-positive risk at screening rounds 1 to 10 by censoring time. Solid line represents subjects with 7 or more observations, dotted line represents subjects with 4 to 6 observations, and dashed line represents subjects with 1 to 3 observations.
