Table 2.

Intrarater reliability for three acquired or analyzed images of muscle thickness and echogenicity by assessor

Parameter	Expert	Novice
Acquisition (n = 10)
Thickness - quadriceps (cm)	0.952 (0.821 - 0.988)	0.999 (0.998 - 1.000)
Thickness - rectus femoris(cm)	0.999 (0.997 - 1.000)	0.997 (0.988 - 0.999)
Echogenicity - square (AU)	1.000 (0.999 - 1.000)	0.996 (0.984 - 0.999)
Echogenicity - trace (AU)	0.999 (0.995 - 1.000)	0.987 (0.949 - 0.997)
Analysis (n = 10)
Thickness - quadriceps (cm)	0.999 (0.996 - 1.000)	1.000 (0.999 - 1.000)
Thickness - rectus femoris(cm)	0.998 (0.994 - 1.000)	0.998 (0.992 - 1.000)
Echogenicity - square (AU)	0.999 (0.998 - 1.000)	0.997 (0.989 - 0.999)
Echogenicity - trace (AU)	0.999 (0.997 - 1.000)	0.988 (0.954 -0.997)

AU - arbitrary units. Results expressed as the intraclass correlation coefficients (95% confidence interval).