Table 4. Agreement between MRI and US for Grading Fatty Infiltration Using the Three-Point Scales.

Muscle	Agreement–Weighted Kappa (95% CI)
	Long axis	Short axis
Supraspinatus
Echogenicity	0.21	0.26
Architecture	0.35	0.32
Infraspinatus
Echogenicity	0.34	0.40
Architecture	0.28	0.62

MRI: magnetic resonance imaging, US: ultrasonography, CI: confidence interval.