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 upper and lower edges of each box represent the interquartile range (25th-75th percentile). The circle in each box is the mean and the line inside each box is the median.
