Table 3.

Three-day measures of quality of turning divided by angle amplitude in non-freezers and freezers.

Measure	Angle type	Non-freezers N = 69	Freezers N = 25	Corrected model
				Group		Angle		Interaction
		Mean ± STD	Mean ± STD	F-value	p-value	F-value	p-value	F-value	p-value
Turn duration	S	2.347 ± 0.317	2.158 ± 0.372	1.915	0.170	9.97	0.002	0.010	0.921
	M	3.042 ± 0.810	2.819 ± 0.694
Coefficient of variation (CV) turn duration	S	0.423 ± 0.042	0.430 ± 0.030	0.103	0.749	0.629	0.430	0.436	0.511
	M	0.392 ± 0.164	0.358 ± 0.216
Mean velocity	S	34.161 ± 4.329	35.587 ± 6.398	1.189	0.279	1.022	0.315	0.345	0.559
	M	36.471 ± 5.825	38.008 ± 5.779
CV mean velocity	S	0.266 ± 0.035	0.265 ± 0.039	0.221	0.639	0.201	0.655	0.221	0.639
	M	0.203 ± 0.083	0.204 ± 0.105
Peak Velocity	S	66.158 ± 8.625	69.526 ± 12.902	1.749	0.190	1.576	0.213	1.654	0.202
	M	73.556 ± 13.206	78.563 ± 16.217
CV peak velocity	S	0.280 ± 0.034	0.273 ± 0.039	0.131	0.719	0.076	0.784	0.306	0.582
	M	0.235 ± 0.104	0.206 ± 0.096
2D jerk	S	10.088 ± 1.192	10.806 ± 1.559	3.137	0.080	0.840	0.362	0.193	0.661
	M	11.617 ± 2.133	12.760 ± 3.118
CV 2D jerk	S	0.325 ± 0.053	0.332 ± 0.066	0.499	0.482	0.487	0.487	3.868	0.053
	M	0.301 ± 0.132	0.221 ± 0.131
ML jerk	S	0.288 ± 0.083	0.368 ± 0.139	3.192	0.078	1.873	0.175	0.196	0.659
	M	0.386 ± 0.191	0.513 ± 0.305
CV ML jerk	S	0.630 ± 0.105	0.664 ± 0.147	0.247	0.621	1.000	0.320	4.779	0.032
	M	0.572 ± 0.259	0.437 ± 0.243
ML range	S	0.266 ± 0.036	0.285 ± 0.046	0.115	0.735	0.576	0.450	0.552	0.460
	M	0.292 ± 0.082	0.307 ± 0.145
CV ML range	S	0.296 ± 0.062	0.304 ± 0.076	1.841	0.179	0.219	0.641	5.938	0.017
	M	0.253 ± 0.158	0.178 ± 0.104

S, small-medium turn angle amplitude; M, medium-large turn angle amplitude.

Disease duration and gait speed are covariates in all of the analyses in this table; bold values indicate when p < 0.05.