Assessing autonomic symptoms of Parkinson’s disease with the SCOPA‐AUT: a new perspective from Rasch analysis
Identifieur interne : 002705 ( Main/Corpus ); précédent : 002704; suivant : 002706Assessing autonomic symptoms of Parkinson’s disease with the SCOPA‐AUT: a new perspective from Rasch analysis
Auteurs : M. J. Forjaz ; A. Ayala ; C. Rodriguez-Blazquez ; B. Frades-Payo ; P. Martinez-MartinSource :
- 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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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Assessing autonomic symptoms of Parkinson’s disease with the SCOPA‐AUT: a new perspective from Rasch analysis</title><author><name sortKey="Forjaz, M J" sort="Forjaz, M J" uniqKey="Forjaz M" first="M. J." last="Forjaz">M. J. Forjaz</name><affiliation><mods:affiliation>National School of Public Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas – CIBERNED), Madrid</mods:affiliation></affiliation></author><author><name sortKey="Ayala, A" sort="Ayala, A" uniqKey="Ayala A" first="A." last="Ayala">A. Ayala</name><affiliation><mods:affiliation>National School of Public Health, Madrid</mods:affiliation></affiliation></author><author><name sortKey="Rodriguez Lazquez, C" sort="Rodriguez Lazquez, C" uniqKey="Rodriguez Lazquez C" first="C." last="Rodriguez-Blazquez">C. Rodriguez-Blazquez</name><affiliation><mods:affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</mods:affiliation></affiliation></author><author><name sortKey="Frades Ayo, B" sort="Frades Ayo, B" uniqKey="Frades Ayo B" first="B." last="Frades-Payo">B. Frades-Payo</name><affiliation><mods:affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</mods:affiliation></affiliation></author><author><name sortKey="Martinez Artin, P" sort="Martinez Artin, P" uniqKey="Martinez Artin P" first="P." last="Martinez-Martin">P. Martinez-Martin</name><affiliation><mods:affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:02F01173A1E5541CE859C58861F1270B84DB6741</idno><date when="2010" year="2010">2010</date><idno type="doi">10.1111/j.1468-1331.2009.02835.x</idno><idno type="url">https://api.istex.fr/document/02F01173A1E5541CE859C58861F1270B84DB6741/fulltext/pdf</idno><idno type="wicri:Area/Main/Corpus">002705</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Assessing autonomic symptoms of Parkinson’s disease with the SCOPA‐AUT: a new perspective from Rasch analysis</title><author><name sortKey="Forjaz, M J" sort="Forjaz, M J" uniqKey="Forjaz M" first="M. J." last="Forjaz">M. J. Forjaz</name><affiliation><mods:affiliation>National School of Public Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas – CIBERNED), Madrid</mods:affiliation></affiliation></author><author><name sortKey="Ayala, A" sort="Ayala, A" uniqKey="Ayala A" first="A." last="Ayala">A. Ayala</name><affiliation><mods:affiliation>National School of Public Health, Madrid</mods:affiliation></affiliation></author><author><name sortKey="Rodriguez Lazquez, C" sort="Rodriguez Lazquez, C" uniqKey="Rodriguez Lazquez C" first="C." last="Rodriguez-Blazquez">C. Rodriguez-Blazquez</name><affiliation><mods:affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</mods:affiliation></affiliation></author><author><name sortKey="Frades Ayo, B" sort="Frades Ayo, B" uniqKey="Frades Ayo B" first="B." last="Frades-Payo">B. 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Martinez-Martin</name><affiliation><mods:affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">European Journal of Neurology</title><idno type="ISSN">1351-5101</idno><idno type="eISSN">1468-1331</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2010-02">2010-02</date><biblScope unit="volume">17</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="273">273</biblScope><biblScope unit="page" to="279">279</biblScope></imprint><idno type="ISSN">1351-5101</idno></series><idno type="istex">02F01173A1E5541CE859C58861F1270B84DB6741</idno><idno type="DOI">10.1111/j.1468-1331.2009.02835.x</idno><idno type="ArticleID">ENE2835</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1351-5101</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Parkinson’s disease</term><term>Rasch analysis</term><term>SCOPA‐AUT</term><term>differential item functioning</term><term>internal construct validity</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>M. J. Forjaz</name><affiliations><json:string>National School of Public Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas – CIBERNED), Madrid</json:string></affiliations></json:item><json:item><name>A. Ayala</name><affiliations><json:string>National School of Public Health, Madrid</json:string></affiliations></json:item><json:item><name>C. Rodriguez‐Blazquez</name><affiliations><json:string>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</json:string></affiliations></json:item><json:item><name>B. 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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. 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J.</forename><surname>Forjaz</surname></persName><affiliation>National School of Public Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas – CIBERNED), Madrid</affiliation></author><author><persName><forename type="first">A.</forename><surname>Ayala</surname></persName><affiliation>National School of Public Health, Madrid</affiliation></author><author><persName><forename type="first">C.</forename><surname>Rodriguez‐Blazquez</surname></persName><affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</affiliation></author><author><persName><forename type="first">B.</forename><surname>Frades‐Payo</surname></persName><affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</affiliation></author><author><persName><forename type="first">P.</forename><surname>Martinez‐Martin</surname></persName><affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</affiliation></author></analytic><monogr><title level="j">European Journal of Neurology</title><idno type="pISSN">1351-5101</idno><idno type="eISSN">1468-1331</idno><idno type="DOI">10.1111/(ISSN)1468-1331</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2010-02"></date><biblScope unit="volume">17</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="273">273</biblScope><biblScope unit="page" to="279">279</biblScope></imprint></monogr><idno type="istex">02F01173A1E5541CE859C58861F1270B84DB6741</idno><idno type="DOI">10.1111/j.1468-1331.2009.02835.x</idno><idno type="ArticleID">ENE2835</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2010</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>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.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>Keywords</head><item><term>differential item functioning</term></item><item><term>internal construct validity</term></item><item><term>Parkinson’s disease</term></item><item><term>Rasch analysis</term></item><item><term>SCOPA‐AUT</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2010-02">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/02F01173A1E5541CE859C58861F1270B84DB6741/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Publishing Ltd</publisherName><publisherLoc>Oxford, UK</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1468-1331</doi><issn type="print">1351-5101</issn><issn type="electronic">1468-1331</issn><idGroup><id type="product" value="ENE"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="EUROPEAN JOURNAL OF NEUROLOGY">European Journal of Neurology</title></titleGroup></publicationMeta><publicationMeta level="part" position="02002"><doi origin="wiley">10.1111/ene.2010.17.issue-2</doi><numberingGroup><numbering type="journalVolume" number="17">17</numbering><numbering type="journalIssue" number="2">2</numbering></numberingGroup><coverDate startDate="2010-02">February 2010</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="20" status="forIssue"><doi origin="wiley">10.1111/j.1468-1331.2009.02835.x</doi><idGroup><id type="unit" value="ENE2835"></id></idGroup><countGroup><count type="pageTotal" number="7"></count></countGroup><titleGroup><title type="tocHeading1">Original Articles</title></titleGroup><copyright>© 2009 The Author(s). Journal compilation © 2009 EFNS</copyright><eventGroup><event type="firstOnline" date="2009-11-12"></event><event type="publishedOnlineFinalForm" date="2010-01-13"></event><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:2.3.2 mode:FullText source:FullText result:FullText" date="2010-03-06"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-01-24"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-10-17"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="273">273</numbering><numbering type="pageLast" number="279">279</numbering></numberingGroup><correspondenceTo>M. J. Forjaz, Escuela Nacional de Sanidad, Instituto de Salud Carlos III, Avda Monforte de Lemos 5, 28029 Madrid, Spain (tel.: +34 91 822 2062; fax: +34 91 387 7869/2;
e‐mail: <email>jforjaz@isciii.es</email>).</correspondenceTo><objectNameGroup><objectName elementName="appendix">Appendix</objectName></objectNameGroup><linkGroup><link type="toTypesetVersion" href="file:ENE.ENE2835.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory>Received 4 March 2009 Accepted 23 July 2009</unparsedEditorialHistory><countGroup><count type="figureTotal" number="3"></count><count type="tableTotal" number="2"></count></countGroup><titleGroup><title type="main">Assessing autonomic symptoms of Parkinson’s disease with the SCOPA‐AUT: a new perspective from Rasch analysis</title><title type="shortAuthors">M. J. Forjaz <i>et al.</i></title><title type="short">SCOPA‐AUT</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1"><personName><givenNames>M. J.</givenNames><familyName>Forjaz</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>A.</givenNames><familyName>Ayala</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a3"><personName><givenNames>C.</givenNames><familyName>Rodriguez‐Blazquez</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a3"><personName><givenNames>B.</givenNames><familyName>Frades‐Payo</familyName></personName></creator><creator creatorRole="author" xml:id="cr5" affiliationRef="#a3"><personName><givenNames>P.</givenNames><familyName>Martinez‐Martin</familyName></personName></creator><creator creatorRole="author" xml:id="cr6" affiliationRef="#a1"><groupName>on behalf of the Longitudinal Parkinson’s Disease Patient Study (<i>Estudio longitudinal de pacientes con enfermedad de Parkinson – ELEP</i>) Group</groupName></creator></creators><affiliationGroup><affiliation xml:id="a1"><unparsedAffiliation>National School of Public Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas – CIBERNED), Madrid</unparsedAffiliation></affiliation><affiliation xml:id="a2"><unparsedAffiliation>National School of Public Health, Madrid</unparsedAffiliation></affiliation><affiliation xml:id="a3" countryCode="ES"><unparsedAffiliation> Area of Applied Epidemiology, National Center for Epidemiology; and <i>CIBERNED</i>, Carlos III Institute of Health, Madrid, Spain</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">differential item functioning</keyword><keyword xml:id="k2">internal construct validity</keyword><keyword xml:id="k3"> Parkinson’s disease</keyword><keyword xml:id="k4">Rasch analysis</keyword><keyword xml:id="k5">SCOPA‐AUT</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><p><b>Background: </b> 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.</p><p><b>Method: </b> The Rasch measurement model was applied to a sample of 385 PD patients.</p><p><b>Results: </b> 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.</p><p><b>Conclusions: </b> 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.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Assessing autonomic symptoms of Parkinson’s disease with the SCOPA‐AUT: a new perspective from Rasch analysis</title></titleInfo><titleInfo type="abbreviated"><title>SCOPA‐AUT</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Assessing autonomic symptoms of Parkinson’s disease with the SCOPA‐AUT: a new perspective from Rasch analysis</title></titleInfo><name type="personal"><namePart type="given">M. J.</namePart><namePart type="family">Forjaz</namePart><affiliation>National School of Public Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas – CIBERNED), Madrid</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A.</namePart><namePart type="family">Ayala</namePart><affiliation>National School of Public Health, Madrid</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">C.</namePart><namePart type="family">Rodriguez‐Blazquez</namePart><affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">B.</namePart><namePart type="family">Frades‐Payo</namePart><affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">P.</namePart><namePart type="family">Martinez‐Martin</namePart><affiliation>Area of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="corporate"><namePart>on behalf of the Longitudinal Parkinson’s Disease Patient Study (Estudio longitudinal de pacientes con enfermedad de Parkinson – ELEP) Group</namePart><description>National School of Public Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas – CIBERNED), MadridNational School of Public Health, MadridArea of Applied Epidemiology, National Center for Epidemiology; and CIBERNED, Carlos III Institute of Health, Madrid, Spain</description></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2010-02</dateIssued><edition>Received 4 March 2009 Accepted 23 July 2009</edition><copyrightDate encoding="w3cdtf">2010</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">3</extent><extent unit="tables">2</extent></physicalDescription><abstract lang="en">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.</abstract><subject lang="en"><genre>Keywords</genre><topic>differential item functioning</topic><topic>internal construct validity</topic><topic>Parkinson’s disease</topic><topic>Rasch analysis</topic><topic>SCOPA‐AUT</topic></subject><relatedItem type="host"><titleInfo><title>European Journal of Neurology</title></titleInfo><genre type="Journal">journal</genre><identifier type="ISSN">1351-5101</identifier><identifier type="eISSN">1468-1331</identifier><identifier type="DOI">10.1111/(ISSN)1468-1331</identifier><identifier type="PublisherID">ENE</identifier><part><date>2010</date><detail type="volume"><caption>vol.</caption><number>17</number></detail><detail type="issue"><caption>no.</caption><number>2</number></detail><extent unit="pages"><start>273</start><end>279</end><total>7</total></extent></part></relatedItem><identifier type="istex">02F01173A1E5541CE859C58861F1270B84DB6741</identifier><identifier type="DOI">10.1111/j.1468-1331.2009.02835.x</identifier><identifier type="ArticleID">ENE2835</identifier><accessCondition type="use and reproduction" contentType="copyright">© 2009 The Author(s). 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