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.
Average follow-up time: 4.8 years. Total follow-up time: 112,820 years. Log rank survival function: chi square = 0.22, p = 0.52. Test of non-zero slope: p = 0.31.
