Table 4.

Pearson correlation coefficients (r)^a of mean angular displacement and angular displacement variation (90^th – 10^th percentile) and Bland Altman bias and limits of agreement of mean angular displacement for the flexion/extension, lateral bending, and axial rotation motion planes.^*

Summary Measure	Accel-1	Comp-1	Accel-2	Comp-2	HM Analyzer
Flexion/Extension
Mean Angular Displacement (r)	0.87	0.87	0.84	0.83	0.80
90th – 10th Percentile (r)	0.87	0.86	0.87	0.85	0.82
Mean Bias (°)	3.91	3.99	1.82	1.23	1.60
Lower Limit of Agreement (°)	−3.40	−3.27	−4.50	−4.72	−5.37
Upper Limit of Agreement (°)	11.22	11.26	8.14	7.17	8.56
Upper – Lower (°)	14.62	14.53	12.64	11.89	13.93
Lateral bending
Mean Angular Displacement (r)	0.23b	0.08c	0.37	0.38	0.42
90th – 10th Percentile (r)	0.60	0.12d	0.85	0.78	0.35
Mean Bias (°)	−0.42	−0.52	−0.41	−0.42	−0.53
Lower Limit of Agreement (°)	−2.56	−3.19	−2.44	−2.27	−4.39
Upper Limit of Agreement (°)	1.72	2.16	1.61	1.44	3.33
Upper – Lower (°)	4.28	5.35	4.05	3.71	7.72
Axial Rotation
Mean Angular Displacement (r)	---	---	---	---	0.15e
90th – 10th Percentile (r)	---	---	---	---	0.73
Mean Bias (°)	---	---	---	---	0.18
Lower Limit of Agreement (°)	---	---	---	---	−4.95
Upper Limit of Agreement (°)	---	---	---	---	5.31
Upper – Lower (°)	---	---	---	---	10.26

^*Column headers are defined in text and Table 1.

^aAll Pearson correlation coefficients (r) were statistically significant (p<0.05) unless otherwise noted.

^bp = 0.18;

^cp = 0.67;

^dp = 0.48;

^ep = 0.38