Table 1.

Correlation coefficient, root-mean-square error, average error of estimate and absolute error for simple and complex movements.

Movement/Task	Range of Motion (°)/Movement Combined	r (Mean [SD])	RMSE Arm Elevation (Mean [SD]) (°)	Average Error of Estimate (Mean [SD]) (°)
Flexion	60	0.968 [0.066]	5.17 [2.81]	4.38 [2.26]
	90	0.998 [0.002]	4.67 [2.95]	3.86 [2.33]
	120	0.997 [0.003]	6.21 [3.90]	4.97 [3.01]
Abduction	60	0.998 [0.001]	2.77 [1.28]	2.37 [1.13]
	90	0.999 [0.0003]	3.75 [2.86]	2.97 [2.18]
	120	0.999 [0.0004]	4.92 [3.02]	3.95 [2.35]
Scaption	60	0.997 [0.002]	3.95 [2.89]	3.17 [2.16]
	90	0.998 [0.001]	5.16 [4.12]	4.18 [3.45]
	120	0.999 [0.001]	6.72 [4.20]	5.46 [3.53]
Trunk movements	Anterior flexion	0.974 [0.057]	7.05 [3.81]	6.08 [3.53]
	Lateral bending	0.970 [0.041]	11.63 [5.56]	9.72 [4.85]
	Rotation	0.917 [0.099]	12.82 [7.61]	10.15 [6.12]
Complex tasks	Mean	0.846 [0.103]	11.48 [2.42]	9.18 [2.02]
	Lower shelf	0.851 [0.111]	9.62 [3.79]	7.77 [2.99]
	Medium shelf	0.840 [0.087]	11.33 [4.04]	9.03 [3.01]
	Higher shelf	0.870 [0.057]	12.68 [2.96]	10.24 [2.35]
	p-value	0.621	0.067	0.054

Legend: r: correlation coefficient; SD: standard deviation; RMSE: root-mean-square error.