Validation of Parkinson’s Disease-Related Questionnaires in South Africa

Table 3

Internal reliability (Cronbach’s alpha) of the modified PDSQ.

Question	n	Alpha
Do you have trouble rising from a chair?	160	0.85
Is your handwriting smaller than it once was?	160	0.85
Do people tell you that your voice is too soft?	159	0.86
Is your balance poor?	158	0.84
Do your feet suddenly seem to get stuck when turning or in doorways?	160	0.83
Do people tell you that you have a blank look on your face?	158	0.85
Do your arms or legs shake?	156	0.84
Do you have trouble doing up your buttons?	157	0.85
Do you shuffle your feet or take tiny steps when you walk?	159	0.83
Overall Cronbach’s alpha		0.86

PDSQ, Parkinson’s Disease Screening Questionnaire.