Figure 3.
Age of initiation and year-wise classification. Shows increase in age group (10-19 years) across the years Z = 1.54 P <0.05 not significant
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.