Motor function in Parkinson's disease and supranuclear palsy: simultaneous factor analysis of a clinical scale in several populations

Table 4 Simultaneous analysis: Final model (Common metric completely standardised solution)

			1	2	3	4	5	6	Residual variances
			Axial Dysfunctioning	Tremor-at-rest	Postural tremor	Rigidity	Brady-kinesia Right	Brady-kinesia Left	On	Off	PSP
3	Tremor-at-rest:	H/N		0.78					0.39	0.63	0.13
4		R Upper		0.69					0.50	0.85	0.19
6	Extremities:	L Upper		0.74					0.33	0.88	0.18
5		R Lower		0.70					0.37	1.09	0.06
7		L Lower		0.73					0.21	1.17	0.08
8	Postural tremor	R			0.90				0.13	0.42	0.04
9		L			0.75				0.27	0.81	0.31
10	Rigidity	Head/Neck				0.67			0.22	0.65	1.02
11		R Upper				0.68			0.40	0.62	0.69
12	Extremities:	L Upper				0.76			0.24	0.64	0.49
13		R Lower				0.70			0.38	0.59	0.66
14		L Lower				0.77			0.20	0.64	0.50
15	Finger taps	R					0.81		0.21	0.44	0.45
16		L						0.82	0.22	0.39	0.47
17	Hand movements	R					0.90		0.14	0.29	0.18
18		L						0.90	0.15	0.27	0.18
19	Rapid alt. mov.	R					0.82		0.18	0.49	0.40
20		L						0.83	0.15	0.45	0.40
21	Leg agility	R					0.72		0.22	0.67	0.71
22		L						0.68	0.31	0.64	0.79
23	Arise from chair		0.82						0.22	0.45	0.34
24	Posture		0.72						0.20	0.42	1.04
25	Gait		0.82						0.15	0.38	0.60
26	Postural stability		0.77						0.28	0.49	0.49
27	Body bradykinesia		0.79						0.34	0.40	0.45
1	Speech		0.60						0.50	0.69	0.80
2	Facial expression		0.60						0.53	056	0.92

The order of some items has been rearranged from their order in the UPDRS to show some patterns more clearly. R = Right-hand side; L = left-hand side; H/N = Head and Neck. All t-values for the loadings were greater than 12.9; for the residual variances they were typically around 8. The smallest t-values were for Right-hand side Postural Tremor (PD-On: 2.2; PD-Off: 4.2; PSP: 0.52); these three residual variances were the only ones with t-values below 4.5.

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