On the expected long-term results from bracing.
From everything I've read, once one has stopped bracing, your chances of progression in adulthood are figured from your ending curve. And the risks are the same as any other person with that size curve.
So, assuming a <6 degree increase in brace (the expected average) - if you brace at 30 degrees and wear your brace as prescribed, the most likely outcome is that you'll enter adulthood at <36 degrees. You then have the same chance of progressing in adulthood as a kid who didn't brace and enters adulthood at 36 degrees.
If you want to know *before* you brace what your risk of progressing in adulthood is, the best numbers are to take your current (pre-brace) curve, add 6, and then figure out the risk that adults with that curve face of progression. Obviously, no one knows how it will turn out for a specific kid, but this gives you some sense of what you might expect.