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Rasch analysis of an instrument for measuring occupational value: Implications for theory and practice
Department of Health Sciences, Lund University, Lund, Sweden & Faculty of Health and Society, Malmö University, Malmö, Sweden.ORCID iD: 0000-0002-0136-3079
Department of Health Sciences, Lund University, Lund, Sweden & The Vårdal Institute, The Swedish Institute for Health Sciences, Lund University, Lund, Sweden.ORCID iD: 0000-0001-5865-2632
Department of Health Sciences, Lund University, Lund, Sweden.
Department of Health Sciences, Lund University, Lund, Sweden.ORCID iD: 0000-0003-2174-372X
2009 (English)In: Scandinavian Journal of Occupational Therapy, ISSN 1103-8128, E-ISSN 1651-2014, Vol. 16, no 2, p. 118-128Article in journal (Refereed) Published
Abstract [en]

This study investigated psychometric properties of an instrument for assessing perceived occupational value, the 26-item OVal-pd. Data from 225 Swedish subjects with and without known mental illness were analysed regarding fit to the Rasch measurement model (partial credit model), differential item functioning (DIF), and functioning of the OVal-pd four-category response scale. The reliability (index of person separation, analogous to Cronbach's alpha) was good (0.92) but there were signs of overall and item level (six items) misfit. There was DIF between people with and without mental illness for three items. Iterative deletion of misfitting items resulted in a new 18-item DIF-free scale with good overall and individual item fit and maintained reliability (0.91). There were no disordered response category thresholds. These observations also held true in separate analyses among people with and without mental illness. Thus, the first steps of ensuring that occupational value can be measured in a valid and reliable way have been taken. Still, occupational value is a dynamic construct and the aspects that fit the construct may vary between contexts. This has implications for, e.g., cross-cultural research and calls for identification of a core set of culture-free items to allow for valid cross-cultural comparisons. Copyright © 2019 Informa UK Limited

Place, publisher, year, edition, pages
London, UK: Informa Healthcare, 2009. Vol. 16, no 2, p. 118-128
Keywords [en]
Instrument development, meaningful activity, measurement, occupational therapy, reliability, validity
National Category
Occupational Therapy
Identifiers
URN: urn:nbn:se:hh:diva-39559DOI: 10.1080/11038120802596253ISI: 000266150200007PubMedID: 19085211Scopus ID: 2-s2.0-69149107045OAI: oai:DiVA.org:hh-39559DiVA, id: diva2:1339066
Available from: 2019-07-25 Created: 2019-07-25 Last updated: 2019-08-21

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Eklund, MonaErlandsson, Lena-KarinHagell, Peter

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