| Not scoliosis || <10°<ref>[https://books.google.se/books?id=fLIkBQAAQBAJ&pg=PA89 Page 89] in: {{cite book|title=The Complete Scoliosis Surgery Handbook for Patients: An In-Depth and Unbiased Look Into What to Expect Before and During Scoliosis Surgery|author=Dr. Kevin Lau|publisher=Health In Your Hands|isbn=9789810785925}}</ref>
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| Mild || 10 - 30°<ref name=ers2015>[https://books.google.com/books?id=PTGpDAAAQBAJ&pg=PA460 Page 460] in: {{cite book|title=ERS Handbook: Self-Assessment in Respiratory Medicine|author=Konrad E. Bloch, Thomas Brack, Anita K. Simonds|publisher=European Respiratory Society|year=2015|isbn=9781849840781}}</ref>