The 39 item Parkinson's disease questionnaire (PDQ-39) revisited: implications for evidence based medicine.

@article{Hagell2007The3I,
  title={The 39 item Parkinson's disease questionnaire (PDQ-39) revisited: implications for evidence based medicine.},
  author={Peter Hagell and Carita Nygren},
  journal={Journal of neurology, neurosurgery, and psychiatry},
  year={2007},
  volume={78 11},
  pages={1191-8}
}
BACKGROUND 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. METHODS Postal survey PDQ-39 data from 202 people with Parkinson's disease (54% men; mean age 70 years) were analysed regarding psychometric properties using traditional and Rasch measurement… CONTINUE READING

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