Assessing autonomic symptoms of Parkinson’s disease with the SCOPA‐AUT: a new perspective from Rasch analysis
Identifieur interne : 000808 ( Main/Exploration ); précédent : 000807; suivant : 000809Assessing autonomic symptoms of Parkinson’s disease with the SCOPA‐AUT: a new perspective from Rasch analysis
Auteurs : M. J. Forjaz [Espagne] ; A. Ayala [Espagne] ; C. Rodriguez-Blazquez [Espagne] ; B. Frades-Payo [Espagne] ; P. Martinez-Martin [Espagne]Source :
- European Journal of Neurology [ 1351-5101 ] ; 2010-02.
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Abstract
Background: The Scale for Outcomes in Parkinson’s disease (PD) for Autonomic Symptoms (SCOPA‐AUT) is a specific scale to assess autonomic dysfunction in PD patients. It was developed and validated under the classic test theory approach. This study sought to test whether the SCOPA‐AUT meets item response theory standards for reliability, internal construct validity, response category ordering, and differential item functioning by gender and age group. Method: The Rasch measurement model was applied to a sample of 385 PD patients. Results: Model fit was obtained after the response categories were rescored and item 10‐Incomplete emptying deleted because of redundancy. Person separation index, a reliability measure, was 0.82. All but two items (2‐Sialorrhea and 13‐Nocturia) were free of gender‐ and age‐related bias. The strict tests of unidimensionality were met, indicating the validity of the total sumscore. Scale targeting suggested the need for items representing milder autonomic symptoms. Conclusions: Suggestions for improving the SCOPA‐AUT include a shorter scale with a simpler response scheme and a combination of sexual items for men and women. The resulting SCOPA‐AUT is a reliable scale, with good internal construct validity, providing Rasch transformed results on a linear metric scale.
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DOI: 10.1111/j.1468-1331.2009.02835.x
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It was developed and validated under the classic test theory approach. This study sought to test whether the SCOPA‐AUT meets item response theory standards for reliability, internal construct validity, response category ordering, and differential item functioning by gender and age group. Method: The Rasch measurement model was applied to a sample of 385 PD patients. Results: Model fit was obtained after the response categories were rescored and item 10‐Incomplete emptying deleted because of redundancy. Person separation index, a reliability measure, was 0.82. All but two items (2‐Sialorrhea and 13‐Nocturia) were free of gender‐ and age‐related bias. The strict tests of unidimensionality were met, indicating the validity of the total sumscore. Scale targeting suggested the need for items representing milder autonomic symptoms. Conclusions: Suggestions for improving the SCOPA‐AUT include a shorter scale with a simpler response scheme and a combination of sexual items for men and women. The resulting SCOPA‐AUT is a reliable scale, with good internal construct validity, providing Rasch transformed results on a linear metric scale.</div></front></TEI><affiliations><list><country><li>Espagne</li></country><region><li>Communauté de Madrid</li></region><settlement><li>Madrid</li></settlement></list><tree><country name="Espagne"><region name="Communauté de Madrid"><name sortKey="Forjaz, M J" sort="Forjaz, M J" uniqKey="Forjaz M" first="M. J." last="Forjaz">M. J. Forjaz</name></region><name sortKey="Ayala, A" sort="Ayala, A" uniqKey="Ayala A" first="A." last="Ayala">A. Ayala</name><name sortKey="Frades Ayo, B" sort="Frades Ayo, B" uniqKey="Frades Ayo B" first="B." last="Frades-Payo">B. Frades-Payo</name><name sortKey="Martinez Artin, P" sort="Martinez Artin, P" uniqKey="Martinez Artin P" first="P." last="Martinez-Martin">P. Martinez-Martin</name><name sortKey="Rodriguez Lazquez, C" sort="Rodriguez Lazquez, C" uniqKey="Rodriguez Lazquez C" first="C." last="Rodriguez-Blazquez">C. Rodriguez-Blazquez</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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