Originally posted by Pooka1
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As far as the range is concerned. I understand how a range would be developed. Yes, it would be statically unlikely that two smallish groups to have the same progression risk. Which is why it's more convincing to me that two small groups, separated by a couple of decades would end up with the same approximate progression percentage. (progressing curves, risser 0-1, cobb 20-29, daily brace wear <7 hrs, ~68%).
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