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Table 2 Mean and inter-operator reproducibility of shear modulus measurements in healthy subjects for various probe positions (training set, n = 16)

From: Real-time shear wave ultrasound elastography: a new tool for the evaluation of diaphragm and limb muscle stiffness in critically ill patients

MeasurementsHealthy subjects (n = 16)
n measuresOperator 1 Mean (SD)Operator 2 Mean (SD)t-test* (p value)Inter-operator reproducibility (ICC)
Diaphragm shear modulus—longitudinal view (kPa)3219.4 (6.2)20.1 (7)0.190.83 [0.50 to 0.94]
Diaphragm shear modulus—transverse view (kPa)3225.4 (7.3)22.4 (6.3)0.730.3 [−0.86 to 0.75]
Biceps brachii shear modulus—transverse view (kPa)3211.1 (3.6)16.1 (6)< 0.050.39 [−0.29 to 0.76]
Biceps brachii shear modulus—longitudinal view (kPa)3228.9 (8.1)27.8 (6.3)0.820.88 [0.67 to 0.96]
Rectus femoris shear modulus—transverse view (kPa)3223 (6.8)24.6 (8.3)0.210.82 [0.50 to 0.94]
Rectus femoris shear modulus—longitudinal view (kPa)3215 (4.9)15.4 (5.4)0.570.76 [0.34 to 0.91]
  1. Abbreviations: ICC intra-class coefficient correlation, kPa kilopascals, SD standard deviation. ICC are presented with 95% confidence interval