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.
Calibration curves at 6, 12, and 24 months. Estimate of calibration accuracy was performed using adaptive spline regression. The line adjacent to the ideal line corresponds to the apparent predictive accuracy. The blue line corresponds to corrected estimates.
