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Title
The 39 item Parkinson's disease questionnaire (PDQ-39) revisited: implications for evidence based medicine.
Authors
Hagell, Peter; Nygren, Carita
Abstract
The 39 item Parkinson's disease questionnaire (PDQ-39) is the most widely used patient reported rating scale in Parkinson's disease. However, several fundamental measurement assumptions necessary for confident use and interpretation of the eight PDQ-39 scales have not been fully addressed.
Publication
Journal of neurology, neurosurgery, and psychiatry, 2007, Vol 78, Issue 11, p1191