Table 2 Mean (standard deviation) of ultrasound variables in the longitudinal plane

 Mean thickness (mm)

6.18 (1.24)

4.76 (1.06)

29.7

1.21

< 0.001*

 Echogenicity (/255)

66.82 (11.43)

77.62 (14.73)

−13.9

−0.81

< 0.001*

 Skewness

0.320 (0.250)

0.173 (0.178)

85.5

0.67

0.012*

 Mean homogeneity

0.691 (0.064)

0.676 (0.064)

2.2

0.23

0.001*

 Homogeneity at 0°

0.778 (0.062)

0.775 (0.060)

0.4

0.05

0.524

 Homogeneity at 90°

0.665 (0.067)

0.646 (0.069)

2.9

0.28

< 0.001*