Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/1484
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dc.contributor.authorPollard, Bethen_UK
dc.contributor.authorDixon, Dianeen_UK
dc.contributor.authorDieppe, Paulen_UK
dc.contributor.authorJohnston, Marieen_UK
dc.date.accessioned2013-06-09T09:42:15Z-
dc.date.available2013-06-09T09:42:15Z-
dc.date.issued2009-05-07en_UK
dc.identifier.urihttp://hdl.handle.net/1893/1484-
dc.description.abstractBackground: The International Classification of Functioning, Disability and Health (ICF) proposes three main health outcomes, Impairment (I), Activity Limitation (A) and Participation Restriction (P), but good measures of these constructs are needed. The aim of this study was to use both Classical Test Theory (CTT) and Item Response Theory (IRT) methods to carry out an item analysis to improve measurement of these three components in patients having joint replacement surgery mainly for osteoarthritis (OA). Methods: A geographical cohort of patients about to undergo lower limb joint replacement was invited to participate. Five hundred and twenty four patients completed ICF items that had been previously identified as measuring only a single ICF construct in patients with osteoarthritis. There were 13 I, 26 A and 20 P items. The SF-36 was used to explore the construct validity of the resultant I, A and P measures. The CTT and IRT analyses were run separately to identify items for inclusion or exclusion in the measurement of each construct. The results from both analyses were compared and contrasted. Results: Overall, the item analysis resulted in the removal of 4 I items, 9 A items and 11 P items. CTT and IRT identified the same 14 items for removal, with CTT additionally excluding 3 items, and IRT a further 7 items. In a preliminary exploration of reliability and validity, the new measures appeared acceptable. Conclusion: New measures were developed that reflect the ICF components of Impairment, Activity Limitation and Participation Restriction for patients with advanced arthritis. The resulting Aberdeen IAP measures (Ab-IAP) comprising I (Ab-I, 9 items), A (Ab-A, 17 items), and P (Ab-P, 9 items) met the criteria of conventional psychometric (CTT) analyses and the additional criteria (information and discrimination) of IRT. The use of both methods was more informative than the use of only one of these methods. Thus combining CTT and IRT appears to be a valuable tool in the development of measures.en_UK
dc.language.isoenen_UK
dc.publisherBioMed Central Ltden_UK
dc.relationPollard B, Dixon D, Dieppe P & Johnston M (2009) Measuring the ICF components of impairment, activity limitation and participation restriction: an item analysis using classical test theory and item response theory. Health and Quality of Life Outcomes, 7 (41). http://www.hqlo.com/content/7/1/41; https://doi.org/10.1186/1477-7525-7-41en_UK
dc.rightsPublished in Health and Quality of Life Outcomes by BioMed Central Ltd.; © 2009 Pollard et al; licensee BioMed Central Ltd.; Publisher statement: "This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited".en_UK
dc.rights.urihttp://creativecommons.org/licenses/by/2.0/en_UK
dc.subjectDisability evaluationen_UK
dc.subjectOsteoarthritisen_UK
dc.subjectArtificial jointsen_UK
dc.titleMeasuring the ICF components of impairment, activity limitation and participation restriction: an item analysis using classical test theory and item response theoryen_UK
dc.typeJournal Articleen_UK
dc.identifier.doi10.1186/1477-7525-7-41en_UK
dc.citation.jtitleHealth and Quality of Life Outcomesen_UK
dc.citation.issn1477-7525en_UK
dc.citation.volume7en_UK
dc.citation.issue41en_UK
dc.citation.publicationstatusPublisheden_UK
dc.citation.peerreviewedRefereeden_UK
dc.type.statusVoR - Version of Recorden_UK
dc.identifier.urlhttp://www.hqlo.com/content/7/1/41en_UK
dc.author.emaildiane.dixon@stir.ac.uken_UK
dc.contributor.affiliationUniversity of Aberdeenen_UK
dc.contributor.affiliationUniversity of Plymouthen_UK
dc.contributor.affiliationUniversity of Aberdeenen_UK
dc.identifier.isiWOS:000267033100001en_UK
dc.identifier.scopusid2-s2.0-67649268330en_UK
dc.identifier.wtid812355en_UK
dcterms.dateAccepted2009-05-07en_UK
dc.date.filedepositdate2009-07-29en_UK
rioxxterms.typeJournal Article/Reviewen_UK
rioxxterms.versionVoRen_UK
local.rioxx.authorPollard, Beth|en_UK
local.rioxx.authorDixon, Diane|en_UK
local.rioxx.authorDieppe, Paul|en_UK
local.rioxx.authorJohnston, Marie|en_UK
local.rioxx.projectInternal Project|University of Stirling|https://isni.org/isni/0000000122484331en_UK
local.rioxx.freetoreaddate2009-07-29en_UK
local.rioxx.licencehttp://creativecommons.org/licenses/by/2.0/|2009-07-29|en_UK
local.rioxx.filenameMeasuring the ICF components of impairment.pdfen_UK
local.rioxx.filecount1en_UK
Appears in Collections:Psychology Journal Articles

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