Table 2 Averages, standard deviations and confidence intervals of the different QUS measurements

  Thickness (cm)

0.56

0.16

0.53–0.59

0.68

0.21

0.60–0.76

0.52

0.10

0.49–0.54

31.88

  Echogenicity (0–255)

82.37

14.44

79.31–85.42

79.32

14.22

73.51–85.13

83.48

13.32

80.19–86.77

−4.98

  Variance

618.72

216.98

572.86–664.58

654.93

213.52

567.66–742.19

605.50

160.62

565.83–645.16

8.16

  Skewness

0.52

0.34

0.45–0.59

0.65

0.25

0.55–0.75

0.47

0.21

0.42–0.53

38.13

  Kurtosis

3.82

1.28

3.54–4.09

4.18

1.02

3.76–4.59

3.68

0.64

3.52–3.84

13.41

  Entropy

6.50

0.24

6.45–6.55

6.51

0.24

6.41–6.61

6.50

0.19

6.46–6.55

0.10

  Contrast

0.64

0.13

0.61–0.67

0.61

0.11

0.57–0.66

0.65

0.11

0.62–0.68

−5.67

  Energy

0.21

0.05

0.20–0.22

0.21

0.04

0.19–0.22

0.21

0.04

0.20–0.22

−2.76

  Homogeneity

0.76

0.03

0.76–0.77

0.77

0.02

0.76–0.77

0.76

0.02

0.75–0.77

0.82

  Area (CSA) (cm²)

0.61

0.23

0.56–0.66

0.76

0.33

0.63–0.90

0.56

0.14

0.52–0.59

36.61

  Thickness (cm)

0.57

0.15

0.54–0.60

0.67

0.20

0.59–0.75

0.53

0.09

0.51–0.55

26.73

  Width (cm)

1.32

0.16

1.28–1.35

1.37

0.19

1.29–1.44

1.30

0.13

1.27–1.33

5.30

  Echogenicity (0–255)

90.98

13.42

88.14–93.81

86.62

14.85

80.55–92.68

92.57

10.97

89.86–95.28

−6.43

  Variance

767.57

207.20

723.77–811.36

789.63

180.44

715.88–863.37

759.51

150.15

722.44–796.59

3.96

  Skewness

0.54

0.25

0.49–0.60

0.63

0.20

0.55–0.71

0.51

0.20

0.46–0.56

24.15

  Kurtosis

3.61

0.83

3.43–3.78

3.78

0.75

3.48–4.09

3.55

0.58

3.40–3.69

6.68

  Entropy

6.74

0.15

6.71–6.77

6.73

0.11

6.68–6.78

6.74

0.12

6.71–6.77

−0.15

  Contrast

0.90

0.16

0.86–0.93

0.84

0.16

0.78–0.91

0.92

0.13

0.89–0.95

−8.33

  Energy

0.14

0.04

0.13–0.15

0.15

0.03

0.13–0.16

0.14

0.03

0.13–0.14

5.76

  Homogeneity

0.73

0.03

0.72–0.73

0.74

0.03

0.72–0.75

0.72

0.02

0.72–0.73

1.95