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.
Sleep efficiency and survival in women with advanced breast cancer. Sleep efficiency of 85% or above is shown in dark blue, associated 95% confidence interval is shown in light blue. Sleep efficiency of less than 85% is shown in red and the associated confidence interval is shown in light red. Censored data are shown in triangles.
