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Table 3 Mean, inter-operator and intra-operator reliability of shear modulus measurements in healthy subjects (validation set, n = 15)

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 = 15) 
Measures (n)Operator 1 Mean (SD)Operator 2 Mean (SD)t-test (p value)Inter-operator reproducibility (ICC)Intra-operator 1 reliability (ICC)Intra-operator 2 reliability (ICC)
Diaphragm shear modulus (kPa)5420 (7.3)20.6 (6.1)0.740.96 [0.85–0.99]0.95 [0.82–0.99]0.90 [0.70–0.98]
Biceps brachii shear modulus (kPa)5222.7 (4.3)24.8 (6.8)0.190.91 [0.54–0.98]0.95 [0.83–0.99]0.96 [0.87–0.99]
Rectus femoris shear modulus (kPa)5211.3 (2.4)11.8 (2)0.410.97 [0.77–0.99]0.92 [0.70–0.98]0.95 [0.82–0.99]
  1. Abbreviations: ICC intra-class coefficient correlation, kPa kilopascals, SD standard deviation. ICC are presented with 95% confidence interval