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.
(A) The receiver operating curves at 6, 12, and 18 months in the training set; (B) The receiver operating curves at 6, 12, and 18 months in the test set; The Kaplan–Meier survival curves of three mortality risk subgroups in the training group (C) and testing group (D).
