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Table 3 The qualitative and quantitative values of the paraspinal muscles in each lumbar segment

From: Paraspinal back muscles in asymptomatic volunteers: quantitative and qualitative analysis using computed tomography (CT) and magnetic resonance imaging (MRI)

L-spine level Men Women
CT MRI CT MRI
GG CSA of PM (mm2) CSA ratio HU GG CSA of PM (mm2) CSA ratio Fat fraction (%) GG CSA of PM (mm2) CSA ratio HU GG CSA of PM (mm2) CSA ratio Fat fraction(%)
L1/2 0.00* 2475.52 171.64* 52.55 0.30* 2464.85 197.43* 8.15 0.07* 1608.45 139.07* 45.91 0.74* 1634.75 161.21* 13.33
L2/3 0.20 2587.25 168.86* 51.46 0.53 2635.92 191.29* 10.17 0.29* 1827.64 144.6* 42.24 0.93* 1851.84 165.07* 15.77
L3/4 0.23* 2687.26 165.36* 47.96 0.83* 2624.13 175.57 13.52 0.75 1953.68 147.73* 38.32 1.11 1968.90 161.93 21.07
L4/5 1.00 2651.20 159.71 44.66 1.37 2419.63 164.36 16.88 1.43 2090.03 160.47 30.65 1.17 1971.08 171.64 27.63
L5/S1 1.40* 2197.15* 143.51 40.53 1.87* 1343.42* 101.86* 23.01 1.82 1764.43* 141.25 22.89 1.89 1218.41* 121.21* 34.84
Total 0.57 2519.67* 387.36* 47.43 0.98 2297.59* 166.14 14.35 0.87 1848.24* 299.71* 36.00 1.27 1728.99* 156.22 22.53
  1. GG Mean Goutallier grade, CSA Cross sectional area, PM Paraspinal muscle, CSA ratio Paraspinal muscle CSA/vertebral body CSA*100, HU Hounsfield unit
  2. In GG (between both men and women), ‘*’ means p < .05 using Mann-Whitney U test
  3. In CSA, CSA ratio (between both men and women), ‘*'means p < .05 using T-test