Here's a link to a more complete presentation of the same research

http://www.ucsfcme.com/2013/MMJ13008...939Degrees.pdf

Two patients were over 35 degrees (one 38 and one 39), the others were between 30 and 35.

He lists the effects on growth in the unknowns:

Unknowns!
– Lower age limit?
– Children between 10 and puberty?
– Effect on growth?
– Overcorrection?
– Larger curves (>40-45°)?