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Table 3: Number patients, HIF/pt., AMF/pt., HIF to AMF ratio, and AMF>HIF/pt. in HIF or AMF-only, HIF+AMF, and AMF>HIF subgroups for all Chiari I and control groups, with and without SL
  No. HIF/Pt. AMF/Pt. Ratio AMF>HIF
All Chiari I 25 8.6 4.1 2.1 2.2
All control 25 3.9 2.7 1.4 1
All Chiari I and controls 
 HIF only 
  Chiari I 1 7 NA NA 2.3
  Control 1 12 NA NA 1.0
 AMF only 0 NA NA NA NA
 HIF+AMF 
  Chiari I 24 8.6 4.3 2.0 2.1
  Control 23 3.9 3 1.3 1.1
  AMF-HIF 
  Chiari I 22 7.9 4.7 1.7 2.5
  Control 16 4.4 3.3 1.3 1.5
 No AMF→HIF 
  Chiari I 3 13.7 1.7 8.2 0
  Control 9 3 1.7 1.8 0
 SL 
  Chiari I 14 10.1 4.6 2.2 2.9
  Control 7 7 3.4 2.1 1.3
 HIF+AMF 
  Chiari I 14 10.1 4.6 2.2 2.2
  Control 6 6.2 4 1.6 1.5
 AMF-HIF 
  Chiari I 12 8.6 5 1.7 2.9
  Control 5 7.2 4 1.8 1.8
 No SL 
  Chiari I 11 6.6 3.5 1.9 1.9
  Control 18 2.7 2.4 1.1 0.8
 HIF+AMF 
  Chiari I 11 6.8 3.9 1.7 2.1
  Control 17 2.9 3 0.9 0.9
 AMF-HIF 
  Chiari I 9 7 4.2 1.7 2.2
  Control 11 3.1 3 1.1 1.2
Note:—NA indicates not applicable.