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Table 4 Mean, inter-operator and intra-operator reliability of shear modulus measurements in critical ill patients (n = 12)

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

MeasurementsCritically ill patients (n = 12)
 Measures (n)Operator 1Mean (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)7213.1 (4.2)14.2 (4.6)0.310.92 [0.71–0.98]0.93 [0.82–0.98]0.92 [0.81–0.98]
Biceps shear modulus (kPa)7018.2 (10)17.4 (8.9)0.710.96 [0.86–0.99]0.98 [0.94–0.99]0.99 [0.96–1]
Rectus femoris shear modulus (kPa)6814.7 (9)18.4 (10.2)0.110.91 [0.51–0.98]0.97 [0.93–0.99]0.99 [0.97–1]
  1. Abbreviations: ICC intra-class coefficient correlation, kPa kilopascals, SD standard deviation. ICC are presented with 95% confidence interval