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.
Kaplan-Meier curves for overall survival for elderly patients who received twice-daily (BD) (dashed red line) or once-daily (OD) radiotherapy (blue line). Hazard ratios (HRs), 95% confidence intervals (Cis), p values and number of patients at risk against yearly intervals are shown.
