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.
Forest plot for risk of coronary heart disease and cardiac mortality in patients with radiotherapy vs those without radiotherapy. The size of each square is proportional to the study's weight (inverse of variance). I2 indicates variation in RR attributable to heterogeneity; RR, relative risk.
