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Measurement properties of the 13-item sense of coherence scale using Rasch analysis
Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Centre for Rehabilitation Research, Örebro County Council, Örebro, sweden. (REAL)ORCID iD: 0000-0001-5418-3154
Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden.
Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden.
Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden.
2015 (English)In: Quality of Life Research, ISSN 0962-9343, E-ISSN 1573-2649, Vol. 24, no 6, 1455-1463 p.Article in journal (Refereed) Published
Abstract [en]

Purpose: The sense of coherence (SOC) scale is widely used and has an extensive history in research. The psychometric properties of the SOC scale have been investigated using classic test theory, but modern test theory enables a more multifaceted investigation of the properties of the SOC scale. The aim of this study was to explore the measurement properties of the SOC scale using the Rasch measurement model.

Methods: SOC questionnaires from a sample of 623 healthy adults were analysed using Rasch analysis. Aspects analysed were rating scale functioning, item fit, unidimensionality, differential item functioning (DIF), targeting, and reliability.

Results: Rating scale analysis showed that the seven scale steps were not utilized in the intended manner and that a shortening to five categories would be beneficial. Twelve out of the 13 items showed acceptable goodness-of-fit and 43 % of the variance was explained by the SOC dimension in the principal components analysis. There was no DIF between subgroups in the sample. The items were well targeted to the sample SOC level with no ceiling or floor effects. Item and person reliability were good and the person separation index was 2.05 indicating that the scale can separate three different levels of SOC, which corresponds well to its theoretical base.

Conclusions: The SOC scale is generally well functioning; however, the three components of SOC seem to influence the PCA results. The scale would benefit from a reduction from seven to five scale steps, which would need to be investigated further.

Place, publisher, year, edition, pages
Springer Netherlands, 2015. Vol. 24, no 6, 1455-1463 p.
Keyword [en]
Sense of coherence, Rasch analysis, Outcome measure, Questionnaire
National Category
Health Care Service and Management, Health Policy and Services and Health Economy
Research subject
Caring sciences
Identifiers
URN: urn:nbn:se:oru:diva-39205DOI: 10.1007/s11136-014-0866-6ISI: 000355822000015PubMedID: 25427429Scopus ID: 2-s2.0-84930484271OAI: oai:DiVA.org:oru-39205DiVA: diva2:767582
Available from: 2014-12-01 Created: 2014-12-01 Last updated: 2017-03-16Bibliographically approved

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Holmefur, MarieLangius-Eklöf, Ann
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