An official website of the United States government
Here's how you know
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.
Adjusted hazard ratio for patient death and overall graft loss by cumulative community risk level. Tier I indicates a cumulative risk of 0-5; tier II, 6-10; tier III, 11-20; tier IV, 21-30; tier V, 31-35; and tier VI, 36-40.