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Table 1: 
Age, sex, incidence (%), and frequency (No./Pt), for HIF, AMF, SL, and AMF>HIF in the Chiari I and non-Chiari I control groups
Age (Median)Sex (F) (%)HIF (%)HIF/Pt.AMF (%)AMF/Pt.SL (No.) (%)AMF>HIF (Mean)
Chiari I (n = 25)4023 (92%)25 (100%)8.5a24 (96%)4.0b14c (56%)2.2
Control (n = 25)4017 (68%)24 (96%)3.9a22 (88%)2.7b7c (28%)1.0
  • ↵a P = .0004.
  • ↵b P = .025.
  • ↵c P < .02 (χ2).