Table 1.

Sensitivity, specificity (the optimum cut-off point for the maximum value of Youden's index), areas under the receiver operating characteristic (ROC) in simultaneous measurements on the platform posturography (P) and the inertial sensor (M) attached to the lumbar L4.

Condition	Measurement method	AUC	p	Sensitivity	Specificity	PPV	NPV	Cut off point
Head shaking posturography 0.3 Hz
1st	P	0.68	<.001	76	60	53	81	0.3
	M	0.64	0.01	92	43	49	90	0.3
2nd	P	0.73	<.001	55	80	62	75	0.4
	M	0.64	0.01	50	80	60	73	0.5
3rd	P	0.82	<.001	66	82	68	80	0.7
	M	0.82	<.001	74	82	70	84	0.7
4th	P	0.94	<.001	84	95	91	91	1.9
	M	0.95	<.001	87	96	92	93	1.5
Head shaking posturography 0.6 Hz
1st	P	0.72	<.001	55	79	60	75	0.3
	M	0.70	<.001	58	79	61	76	0.4
2nd	P	0.78	<.001	63	86	73	80	0.4
	M	0.68	0.001	66	74	60	79	0.4
3rd	P	0.85	<.001	71	88	77	84	0.8
	M	0.87	<.001	74	92	85	86	0.8
4th	P	0.92	<.001	95	77	70	96	1.5
	M	0.92	<.001	82	88	80	89	1.3

Conditions: 1st (eyes open/stable surface), 2nd (eyes closed/stable surface), 3rd (eyes open/foam), 4th (eyes closed/foam).

The most significant results are in bold.

P platform posturography, M MediPost (IMU), AUC area under curve, PPV positive predictive value, NPV negative predictive value.