Psychometric validation of the revised SCOPA-Diary Card: expanding the measurement of non-motor symptoms in parkinson's disease

Table 3 Item-Scale Correlations Corrected for Overlap and Reliability Statistics for Three-Factor Model

	Mobility	Physical Functioning	Psychological Functioning	Cronbach's Alpha	Cronbach's Alpha-item deleted
MOBILITY				0.87
01. Walking	0.77	0.59	0.51		^┼
02. Changing position	0.77	0.67	0.55		^┼
PHYSICAL FUNCTIONING				0.86
03. Using your hands	0.63	0.81	0.50		0.83
04. Uncontrollable movements	0.37	0.72	0.53		0.84
05. Feelings of exhaustion or fatigue	0.61	0.83	0.65		0.83
08. Unexplained pains	0.63	0.74	0.56		0.82
10. Frequent or urgent urination	0.43	0.77	0.56		0.83
11. Sweating too much	0.35	0.59	0.45		0.86
PSYCHOLOGICAL FUNCTIONING				0.83
06. Difficulty concentrating or remembering	0.55	0.69	0.72		^┼
07. Feelings of anxiety or panic	0.47	0.56	0.72		^┼
Model Based Reliability	0.88	0.87	0.86

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