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.
Distribution of participants without Medicare claims for coronary heart disease using the 6-month all-available look-back period and the expanded algorithm, by length of continuous Medicare coverage prior to the study telephone interview, Reasons for Geographic and Racial Differences in Stroke (REGARDS) Study, 1999–2007.
