Table 3.

Repeated-measures analysis of covariance for articulatory kinematic measures.

Source	Average speed (mm/s)			Cumulative distance (mm)		Horizontal (z) movement range (mm)		Vertical (y) movement range (mm)		Movement duration (s)		STI
	df	F	p	F	p	F	p	F	p	F	p	F	p
Grp a	1	1.97	.17	1.16	.292	4.15	.05	0.21	.650	2.26	.145	0.01	.915
Art	2	640.7	< .0001	775.24	< .0001	424.07	< .0001	290.37	< .0001	78.64	< .0001	4.87	.012
Complex	2	14.4	< .0001	39.47	< .0001	32.83	< .0001	3.71	.031	3.91	.026	6.15	.004
Grp × Art	2	2.21	.119	2.49	.092	4.7	.013	4.26	.019	11.01	.0001	7.23	.002
Grp × Complex	2	2.35	.105	2.32	.108	0.94	.398	3.25	.046	0.14	.870	0.4	.672
Grp × Art × Complex	8	2.74	.009	3.35	.002	4.38	.0001	2.2	.034	0.99	.448	1.47	.179

Note. Bolded text indicates p < .05. STI = spatiotemporal variability index; Grp = group; Art = articulator; Complex = complexity levels.

^a n = 15 for the PD group and n = 15 for the healthy control group.