Table 3

Distances between spinal segments and reliability indicators

Intermammillary distance (right and left, averaged)Interspinous process distance
UltrasoundSegmentL4–L5L3–L4L2–L3L2–L5L4–L5L3–L4L2–L3L2–L5
Mean (cm)2.622.923.218.752.612.912.948.44
SD0.280.290.350.720.370.280.380.75
SEm0.070.080.090.120.050.030.020.18
%SEm2.712.632.941.332.101.120.832.16
MDD at 95%0.200.210.260.320.150.090.070.51
ICC(3,1)0.940.930.930.970.980.991.000.94
ICC 95% CI0.85 to 0.970.84 to 0.970.82 to 0.970.94 to 0.990.92 to 0.990.95 to 1.000.98 to 1.000.86 to 0.98
Average intervertebral disc height
MRISegmentL4–L5L3–L4L2–L3L2–L5
Mean (cm)0.760.680.628.29
SD (cm)0.110.150.120.29
SEm0.020.020.010.03
%SEm1.492.271.861.73
MDD at 95%2.213.512.120.40
ICC(3,1)0.980.980.990.99
ICC 95% CI0.96 to 0.990.96 to 0.990.96 to 0.990.96 to 0.99
  • ICC, intraclass correlation coefficient; MDD, minimal detectable difference; SEm, SE of the measurement.