Sure, but does that mean they are functionally illiterate? I didn't see anything in that article to that effect.
Yes - you are correct, they don't explain that in this report, they assume you have some knowledge of PA terminology :)
Dumb, huh ? To understand their definitions read this:
http://www.pde.state.pa.us/a_and_t/site/default.asp?g=0&a_and_tNav=%7C630%7C&k12Nav=%7C1141%7C
Even then they don't come out and say it plainly, but the below basic definition is a non-reader for all practical purposes.