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.
Survival curves for male with same‐sex co‐twins (red line) and male with opposite‐sex co‐twins (blue line) tested at age 60 and beyond. DZOS = dizygotic opposite‐sex twins; DZSS = dizygotic same‐sex twins. Shaded region around each curve is the 95% confidence band
