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The 39-item Parkinson's Disease Questionnaire (PDQ-39): is it a unidimensional construct?
The 39-item Parkinson's Disease Questionnaire, and particularly its summary index (PDQ-39SI) is a widely used patient-reported clinical trial endpoint. A basic assumption when summing items into a total score is that they represent a common variable. We therefore assessed the unidimensionality...
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| Main Authors: | , |
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| Formato: | Artigo |
| Idioma: | Inglês |
| Publicado em: |
SAGE Publishing
2009-07-01
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| Colecção: | Therapeutic Advances in Neurological Disorders |
| Acesso em linha: | https://doi.org/10.1177/1756285609103726 |
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