Table 2.

Three-day measures of quantity and quality of turning in non-freezers and freezers.

Measure	Non-freezers N = 69	Freezers N = 25	Corrected model
	Mean ± STD	Mean ± STD	F-value	p-value
Quantity
N turns/30 min	19.3 ± 9.2	22.4 ± 12.9	1.821	0.181
Quality
Turn angle (degrees)	92.5 ± 5.3	89.0 ± 9.2	5.850	0.018
Coefficient of variation (CV) turn angle	0.40 ± 0.05	0.39 ± 0.05	2.713	0.103
Turn duration (s)	2.4 ± 0.3	2.2 ± 0.4	3.718	0.072
CV turn duration	0.42 ± 0.05	0.43 ± 0.03	0.611	0.437
Mean velocity (degrees/s)	34.4 ± 4.3	35.7 ± 6.5	1.057	0.307
CV mean velocity	0.26 ± 0.03	0.26 ± 0.04	1.769	0.187
Peak velocity (degrees/s)	67.0 ± 8.9	70.0 ± 13.4	1.359	0.247
CV peak velocity	0.28 ± 0.03	0.27 ± 0.04	0.278	0.600
2D jerk (m2/s5)	10.2 ± 1.2	10.9 ± 1.6	5.636	0.020
CV 2D jerk	0.32 ± 0.06	0.33 ± 0.07	3.721	0.057
ML jerk (m2/s5)	0.29 ± 0.09	0.37 ± 0.14	6.249	0.014
CV ML jerk	0.63 ± 0.11	0.66 ± 0.15	4.606	0.035
ML range (m2/s)	0.27 ± 0.04	0.29 ± 0.05	1.491	0.225
CV ML range	0.29 ± 0.06	0.30 ± 0.08	1.533	0.219

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