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.
In A and B, the plus sign refers to the median value. The vertical lines ending in small horizontal line segments represent the 25th to 75th percentiles. BPI indicates brief pain inventory; VAS, visual analog scale.
