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Table 6 Frequency of symmetry and asymmetry in boys by age (year).

From: Trunk asymmetry in juveniles

  Thoracic           
   Symmetry 1 -1 2 -2 Total
   N % N % N % N % N % N %
Age 3 3 0.25          3 0.18
  4 4 0.33          4 0.25
  5 22 1.82 1 0.38 2 1.41      25 1.53
  6 231 19.11 55 20.83 21 14.79 1 9.09 2 66.67 310 19.03
  7 311 25.72 56 21.21 37 26.06 5 45.45    409 25.11
  8 297 24.57 68 25.76 29 20.42 1 9.09 1 33.33 396 24.31
  9 341 28.21 84 31.82 53 37.32 4 36.36    482 29.59
Total   1209 100.00 264 100.00 142 100.00 11 100.00 3 100.00 1629 100.00
  Thoracolumbar           
   Symmetry 1 -1 2 -2 Total
   N % N % N % N % N % N %
Age 3 2 0.17 1 0.36        3 0.18
  4 3 0.26    1 0.60      4 0.25
  5 21 1.82 3 1.09 1 0.60      25 1.53
  6 230 19.91 50 18.18 28 16.67 1 4.55 1 11.11 310 19.03
  7 295 25.54 57 20.73 43 25.60 9 40.91 5 55.56 409 25.11
  8 273 23.64 75 27.27 42 25.00 5 22.73 1 11.11 396 24.31
  9 331 28.66 89 32.36 53 31.55 7 31.82 2 22.22 482 29.59
Total   1155 100.00 275 100.00 168 100.00 22 100.00 9 100.00 1629 100.00
  Lumbar           
   Symmetry 1 -1 2 -2 Total
   N % N % N % N % N % N %
Age 3 2 0.18 1 0.33        3 0.18
  4 4 0.36          4 0.25
  5 17 1.52 5 1.66 2 1.18 1 3.57    25 1.53
  6 223 19.95 62 20.53 21 12.43 2 7.14 2 16.67 310 19.03
  7 270 24.15 81 26.82 43 25.44 9 32.14 6 50.00 409 25.11
  8 274 24.51 72 23.84 43 25.44 6 21.43 1 8.33 396 24.31
  9 328 29.34 81 26.82 60 35.50 10 35.71 3 25.00 482 29.59
Total   1118 100.00 302 100.00 169 100.00 28 100.00 12 100.00 1629 100.00
  1. Scoliometer readings are at standing forward bending position. 1: mild right asymmetry (ATR 1–6o), 2: severe right asymmetry (ATR ≥ 7o), -1 mild left asymmetry (ATR 1–6o), -2: severe left asymmetry (ATR ≥ 7o).