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Number, sex, tonsillar location, and Cobb angles of patients analyzed

No.FemalesMean Age (yr)Age Range (yr)Minimum Tonsillar Herniation (mm)Mean and Range of Cobb Angles
Chiari2193–142518° (16°–19°)
Chiari plus syrinx2011912–19834° (15°–87°)
Syrinx only83101–17N/A20° (15°–40°)
No Chiari or syrinx2419111–18N/A35° (15°–82°)
  • Note:—N/A indicates not applicable.