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.
Sample Counts for Included and Excluded Observations
Figure shows the number of men excluded at each stage in the sample creation process. SEER: Surveillance, Epidemiology, and End Results; HMO: Health maintenance organization; ESRD: End-stage renal disease; FFS: Fee-for-service.
