It doesn't show us that much does it?

The conclusion of the article says a lot to me though.

It's a pity they went to all that trouble to do a randomized trial and only
included certain ages (11 to 22 - Adolescents) and over such a short time span. Shame really.

http://pediatrics.aappublications.or...-0966.full.pdf
Full Article pdf

Benefits of Strict Rest After Acute Concussion: A Randomized Controlled Trial

Danny George Thomas MD, MPH, Jennifer N. Apps PhD, Raymond G. Hoffmann PhD, Michael McCrea PhD, Thomas Hammeke PhD