Table 6.

Receiver operating characteristic curve statistical outcomes.

Device	Balance task	Accelerometry variable	AUC (SE)	p-value	95% Confidence Interval
Smartphone	Eyes open	RMS ML	0.867 (0.130)	0.045*	[0.612, 1.000]
		RMS AP	0.600 (0.181)	0.584	[0.245, 0.955]
		CEA	0.500 (0.207)	1.000	[0.094, 0.906]
	Eyes closed	RMS ML	0.433 (0.188)	0.715	[0.065, 0.801]
		RMS AP	0.667 (0.174)	0.361	[0.325, 1.000]
		CEA	0.467 (0.209)	0.855	[0.094, 0.906]
	Functional reach	RMS ML	0.700 (1.70)	0.273	[0.366, 1.000]
		RMS AP	0.533 (0.189)	0.855	[0.164, 0.903]
		CEA	0.500 (0.187)	1.000	[0.133, 0.867]
	Functional stability boundary	RMS ML	0.933 (0.078)	0.018*	[0.780, 1.000]
		RMS AP	0.500 (0.186)	1.000	[0.134, 0.866]
		CEA	0.800 (0.144)	0.100	[0.518, 1.000]
Research-grade accelerometer	Eyes open	RMS ML	0.867 (0.130)	0.045*	[0.612, 1.000]
		RMS AP	0.600 (0.181)	0.584	[0.245, 0.955]
		CEA	0.400 (0.201)	0.584	[0.005, 0.795]
	Eyes closed	RMS ML	0.867 (0.130)	0.045*	[0.612, 1.000]
		RMS AP	0.600 (0.181)	0.584	[0.245, 0.955]
		CEA	0.367 (0.182)	0.465	[0.011, 0.723]
	Functional reach	RMS ML	0.767 (0.149)	0.144	[0.474, 1.000]
		RMS AP	0.500 (0.192)	1.000	[0.123, 0.877]
		CEA	0.533 (0.189)	0.855	[0.164, 0.903]
	Functional stability boundary	RMS ML	0.900 (0.104)	0.028*	[0.697, 1.000]
		RMS AP	0.500 (0.186)	1.000	[0.134, 0.866]
		CEA	0.833 (0.128)	0.068	[0.583, 1.000]

AUC, area under the curve; SE, standard error.

^*p < 0.05.