Table 2.

Reliability of the Ultrasound Image Analyses

Measure	Intrarater		Interrater
	ICC (3,1)	SEM	ICC (2,k)	SEM
Vastus lateralis
CSAa	0.845	134.57	0.811	146.97
EIa	0.935	1.20	0.904	1.61
Rectus femoris
CSA	0.865	97.94	0.845	105.45
EI	0.944	1.84	0.945	1.95
Vastus medialis
CSA	0.846	149.89	0.816	162.31
EI	0.928	1.91	0.924	2.01

Abbreviations: CSA, cross-sectional area; EI, echo intensity; ICC, intraclass correlation coefficient; SEM, standard error of the measurement.

^aAll CSA values were reported in mm.²

^bAll EI ranges = 0–255.