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 colored boxes include the middle 50% of each group. The horizontal line within the colored box represents the median. The data between the colored box and the tails contain the upper and lower quartiles, excluding outliers, which are represented by stars and filled circles.
