Abstract
Background and objectives
Health status measures, used to measure the subjective functioning and well-being
of respondents, are increasingly being used in trials of treatments that are undertaken
in a variety of countries. To assess comparability of results gained from such cross-cultural
studies, it is important for researchers to know the comparability of instruments
across cultures. One measure widely used in cross-cultural studies is the Parkinson's
Disease Questionnaire (PDQ-39). We evaluated response rate, data quality, score reliability,
and scaling assumptions of the instrument in the United States, Canada, Spain, Italy,
and Japan.
Methods
Our data were gained from the Global Parkinson's Disease Survey, a cross-national
survey, in which the PDQ-39 was interviewer administered to respondents.
Results
Our data suggest that the PDQ-39 is, for the most part, a valid and reliable measure
that can be appropriately and meaningfully used in cross-cultural studies. However,
one of the dimensions of the measure, Social Support, may not be sufficiently reliable
to be used as a primary endpoint in trials.
Conclusion
The PDQ-39 seems to be sufficiently robust to be used in trials and surveys in cross-cultural
studies.
Keywords
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Article info
Publication history
Accepted:
April 29,
2003
Identification
Copyright
© 2003 Elsevier Inc. Published by Elsevier Inc. All rights reserved.
