Table 2.

Clinical performance of ultrasound Nakagami imaging in diagnosing walking function.

Muscle		Rectus femoris	tibialis anterior	Gastrocnemius
Median (IQR) of the Nakagami parameter	Control	0.72 (0.64–0.79)	0.64 (0.62–0.70)	0.50 (0.46–0.56)
	Stage 1	0.88 (0.83–0.97)	0.82 (0.75–0.90)	0.63 (0.55–0.73)
	Stage 2	0.75 (0.67–0.85)	0.89 (0.86–0.93)	0.85 (0.77–0.90)
	Stage 3	0.84 (0.78–1.03)	0.88 (0.81–0.95)	0.85 (0.81–0.88)
Dynamic range of the parameter		0.48–1.22	0.51–1.09	0.35–1.04
Cutoff value		0.85	0.87	0.73
Sensitivity, %		66.6	66.66	76.31
Specificity, %		67.6	70	94.73
Accuracy, %		67.1	68.33	85.52
LR+		2.06	2.22	14.5
LR−		0.49	0.47	0.25
PPV, %		66.66	68.96	93.54
NPV, %		67.64	67.74	80
AUROC		0.67	0.72	0.89
(95% CI)		(0.54–0.80)	(0.59–0.85)	(0.81–0.96)

LR+: positive likelihood ratio, LR−: negative likelihood ratio, PPV: positive predictive value, NPV: negative predictive value, AUROC: area under the receiver operating characteristics curve.