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dc.contributor.authorWentzel-Larsen, Toreeng
dc.contributor.authorNorekvål, Tone M.eng
dc.contributor.authorUlvik, Bjørgeng
dc.contributor.authorNygård, Ottareng
dc.contributor.authorPripp, Are Hugoeng
dc.date.accessioned2012-01-24T10:00:36Z
dc.date.available2012-01-24T10:00:36Z
dc.date.issued2011-10-05eng
dc.identifier.citationBMC Medical Research Methodology 2011, 11:137en
dc.identifier.issn1471-2288eng
dc.identifier.urihttp://hdl.handle.net/1956/5516
dc.description.abstractBackground: Questionnaires are used extensively in medical and health care research and depend on validity and reliability. However, participants may differ in interest and awareness throughout long questionnaires, which can affect reliability of their answers. A method is proposed for “screening” of systematic change in random error, which could assess changed reliability of answers. Methods: A simulation study was conducted to explore whether systematic change in reliability, expressed as changed random error, could be assessed using unsupervised classification of subjects by cluster analysis (CA) and estimation of intraclass correlation coefficient (ICC). The method was also applied on a clinical dataset from 753 cardiac patients using the Jalowiec Coping Scale. Results: The simulation study showed a relationship between the systematic change in random error throughout a questionnaire and the slope between the estimated ICC for subjects classified by CA and successive items in a questionnaire. This slope was proposed as an awareness measure - to assessing if respondents provide only a random answer or one based on a substantial cognitive effort. Scales from different factor structures of Jalowiec Coping Scale had different effect on this awareness measure. Conclusions: Even though assumptions in the simulation study might be limited compared to real datasets, the approach is promising for assessing systematic change in reliability throughout long questionnaires. Results from a clinical dataset indicated that the awareness measure differed between scales.en
dc.language.isoengeng
dc.publisherBioMed Centraleng
dc.rightsAttribution CC BYeng
dc.rights.urihttp://creativecommons.org/licenses/by/2.0/eng
dc.titleA proposed method to investigate reliability throughout a questionnaireeng
dc.typePeer reviewedeng
dc.typeJournal articleeng
dc.subject.nsiVDP::Medical disciplines: 700::Health sciences: 800::Health service and health administration research: 806eng
dc.rights.holderCopyright 2011 Wentzel-Larsen et al; licensee BioMed Central Ltd.
dc.type.versionpublishedVersioneng
bora.peerreviewedPeer reviewedeng
bibo.doihttp://dx.doi.org/10.1186/1471-2288-11-137eng
dc.identifier.cristinID869638eng
dc.identifier.doi10.1186/1471-2288-11-137


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