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.
The y-axes differ in scale between male and female graphs to reflect differing incidence rates between sexes. The colored section of the higher-scale y-axis represents the entirety of the lower-scale y-axis.
