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. 2019 Sep 27;14(9):e0222682. doi: 10.1371/journal.pone.0222682

Table 3. Sex-specific percentiles (P) of the osseous spinal canal (OSC), the dural sac (DS), the spinal cord (SC), the vertebral body (VB), the space available for the cord (SAC), and the Torg ratio (TR).

  Male (N = 1,194) Female (N = 1,259)
Items P 0 P 2.5 P 5 P 25 P 50 P 75 P 95 P 97.5 P 100 P 0 P 2.5 P 05 P 25 P 50 P 75 P 95 P 97.5 P 100
OSC (mm)
C2 11 15 16 17 18 19 20 21 23 12 15 15 17 18 18 20 20 23
C3 11 13 13 15 16 17 18 19 22 12 13 13 15 16 17 18 18 21
C4 10 12 13 15 16 17 18 18 22 10 13 13 14 15 16 18 18 20
C5 11 12 13 14 15 16 18 18 21 11 12 13 14 15 16 17 18 23
C6 10 12 13 14 15 16 18 19 21 10 12 13 14 15 16 17 17 20
C7 12 13 14 15 16 17 18 19 22 11 13 13 14 15 16 17 18 19
DS (mm)    
C2 10 11 11 12 13 15 16 17 18 9 11 11 12 13 15 16 16 18
C3 8 10 11 12 13 14 16 16 19 9 10 11 12 13 13 15 16 18
C4 7 10 10 12 13 14 16 16 19 9 10 10 11 13 13 15 16 17
C5 8 10 10 11 13 14 15 16 19 8 9 10 11 12 13 15 15 17
C6 8 10 10 12 13 14 15 16 18 7 9 10 11 12 13 15 15 18
C7 10 11 11 13 14 15 16 17 19 9 11 11 12 13 14 15 16 18
SC (mm)    
C2 5 6 7 7 8 8 9 9 10 6 6 7 7 8 8 9 9 10
C3 5 6 6 7 7 8 9 9 9 6 6 6 7 7 8 8 9 9
C4 5 6 6 7 7 8 8 9 10 5 6 6 7 7 8 8 9 10
C5 5 6 6 7 7 8 8 9 9 5 6 6 7 7 8 8 8 11
C6 5 6 6 6 7 7 8 8 9 5 6 6 6 7 7 8 8 10
C7 4 5 6 6 7 7 8 8 9 5 5 6 6 7 7 8 8 9
VB (mm)                                    
C2 12 15 15 16 17 18 19 20 23 11 12 13 14 15 16 17 17 19
C3 12 14 15 16 17 18 19 20 26 11 13 13 14 15 16 17 17 19
C4 12 14 15 16 17 18 20 21 26 10 13 13 14 15 16 17 18 20
C5 12 14 14 16 17 18 20 22 25 10 13 13 14 15 16 18 18 21
C6 12 14 15 16 18 19 21 22 27 11 13 13 14 15 16 18 19 25
C7 13 15 15 17 18 19 20 21 25 12 13 13 15 15 16 18 18 21
SAC (mm)    
C2 2 3 4 5 6 7 9 10 11 2 3 3 5 6 7 9 9 11
C3 1 3 3 4 5 7 8 9 11 2 3 3 4 5 6 8 9 11
C4 0 3 3 4 5 7 8 9 11 1 3 3 4 5 6 8 9 10
C5 1 3 3 4 5 7 8 9 11 0 2 3 4 5 6 8 8 10
C6 0 3 3 5 6 7 8 9 11 0 2 3 4 5 6 8 8 11
C7 3 4 5 6 7 8 10 10 13 2 4 4 5 6 7 9 9 11
TR     
C2 0.58 0.83 0.85 1 1.06 1.17 1.31 1.36 1.83 0.72 0.94 0.94 1.07 1.2 1.29 1.5 1.58 1.92
C3 0.5 0.68 0.72 0.88 0.94 1.06 1.2 1.25 1.58 0.67 0.76 0.82 1 1.07 1.2 1.38 1.38 1.64
C4 0.48 0.65 0.68 0.83 0.93 1 1.14 1.21 1.58 0.63 0.75 0.78 0.94 1 1.14 1.31 1.38 1.6
C5 0.46 0.62 0.67 0.81 0.89 1 1.14 1.21 1.42 0.57 0.7 0.74 0.88 1 1.13 1.29 1.33 1.77
C6 0.45 0.6 0.65 0.76 0.88 1 1.13 1.21 1.5 0.55 0.67 0.71 0.87 0.94 1.07 1.23 1.29 1.54
C7 0.5 0.68 0.71 0.83 0.89 1 1.13 1.2 1.4 0.62 0.72 0.78 0.88 1 1.07 1.21 1.29 1.46