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.
Solid line shows mean error (videoPR—refPR), dashed lines indicate mean error ± 1.96 times standard deviation of the error. Dotted line represents the regression line, regression coefficient was insignificant (p = 0.085).
