Table 1

Interobserverand intraobserver reliability of the ultrasound and anatomic measurements of muscle thickness and cross-sectional area

Variable	Intraobserver reliability		Interobserver reliability
Variable	ICC	P value	ICC	P value
Ultrasound measurements
Biceps brachii MT (mm)	0.99	<0.0001	0.94	<0.0001
Rectus femoris MT (mm)	0.99	<0.0001	0.97	<0.0001
Biceps brachii CSA (mm²)	0.99	<0.0001	0.97	<0.0001
Rectus femoris CSA (mm²)	0.99	<0.0001	0.93	<0.0001
Anatomic measurements
Biceps brachii MT (mm)	0.99	<0.0001	0.97	<0.0001
Rectus femoris MT (mm)	0.99	<0.0001	0.97	<0.0001
Biceps brachii CSA (mm²)	0.99	<0.0001	0.98	<0.0001
Rectus femoris CSA (mm²)	0.99	<0.0001	0.99	<0.0001

CSA, cross-sectional area; ICC, intraclass correlation coefficient; MT, muscle thickness.