Figure 1.
a The survival curve of all study participants.
b The survival curve of study participants grouped by club drugs abuse status.
c The survival curve of study participants grouped by alcohol abuse status.
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.