Table 3.

Comparison between the optoelectronic (marker-based system, MBS) and the Kinect (markerless system, MLS) systems. R is the Pearson coefficient of correlation, RCP is the reproducibility coefficient expressed in percent, and CV is the coefficient of variation.

Joint	Variables	R	RCP (%)	CV
Right Shoulder	Length (mm)	0.71 *	45	32
	Angle (deg)	0.56 *	32	41
	Velocity (m/s)	0.96 *	31	18
	Angular velocity (deg/s)	0.50	71	47
	Volume (mm${}^3$)	0.73 *	65	45
	Sphere (cm${}^3$)	0.98 *	63	40
	Surface (mm${}^2$)	0.83 *	52	53
Left Shoulder	Length (mm)	0.72 *	35	38
	Angle (deg)	0.58 *	46	41
	Velocity (m/s)	0.94 *	31	19
	Angular velocity (deg/s)	0.56	67	44
	Volume (mm${}^3$)	0.64 *	54	55
	Sphere (cm${}^3$)	0.96 *	55	38
	Surface (mm${}^2$)	0.98 *	60	51
Right Wrist	Length (mm)	0.71 *	35	38
	Angle (deg)	0.88 *	21	26
	Velocity (m/s)	0.95 *	33	16
	Angular velocity (deg/s)	0.51	58	75
	Volume (mm${}^3$)	0.79 *	57	40
	Sphere (cm${}^3$)	0.97 *	66	56
	Surface (mm${}^2$)	0.98 *	53	48
Left Wrist	Length (mm)	0.68 *	39	34
	Angle (deg)	0.92 *	16	24
	Velocity (m/s)	0.89 *	28	15
	Angular velocity (deg/s)	0.47	57	46
	Volume (mm${}^3$)	0.72 *	41	49
	Sphere (cm${}^3$)	0.88 *	55	45
	Surface (mm${}^2$)	0.95 *	47	43

* Statistically significant correlation (p < 0.05).