Confirmatory Factor Analysis of the Motor Unified Parkinson’s Disease Rating Scale

Table 2

Factor loadings for confirmatory factor analysis off and on Parkinson disease medications.

	OFF medication	ON medication
	Factor loadings	Factor loadings
Tests of model fit
CFI	0.962	0.963
TLI	0.955	0.956
RMSEA	0.059	0.060
Factor 1: Gait/Posture
Speech	0.681	0.677
Facial expression	0.640	0.635
Arising from chair	0.752	0.781
Posture	0.800	0.788
Gait	0.744	0.761
Postural stability	0.572	0.591
Body bradykinesia and hypokinesia	0.874	0.861
Factor 2: Tremor
Tremor at rest—face, lips, chin	0.621	0.604
Tremor at rest—right hand	0.220	0.236
Tremor at rest—left hand	0.772	0.752
Action/Postural tremor—right hand	0.480	0.499
Action/Postural tremor—left hand	0.818	0.833
Factor 3: Rigidity
Rigidity—neck	0.471	0.461
Rigidity—right lower limb	0.914	0.917
Rigidity—left lower limb	0.892	0.882
Factor 4: Right
Rigidity—right upper limb	0.682	0.687
Finger taps—right hand	0.594	0.601
Hand movements—right hand	0.712	0.709
Rapid movements—right hand	0.711	0.709
Leg agility—right leg	0.768	0.770
Factor 5: Left
Rigidity—left upper limb	0.788	0.781
Finger taps—left hand	0.778	0.786
Hand movements—left hand	0.806	0.802
Rapid movements—left hand	0.814	0.798
Leg agility—left leg	0.797	0.726

CFI: Comparative fit index; TLI: Tucker-Lewis Index; RMSEA: Root mean square error of approximation.