When my DD (then 6) took the OLSAT, she got a verbal score, a non-verbal score, and a total (which I think is what they've called "Total SAI" on yours).
Our district uses it for gifted screening, although I suspect that's due to convenience more than anything.
I don't know if the Lexile measure came from a different test - we didn't get a score for that. There's an article explaining it here:
http://www.lexile.com/m/uploads/dow...09/What-does-the-Lexile-measure-mean.pdf If you search their website for books in the 820 range, then look those same books up on the AR website, they're in the 5th grade range.
