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The Case for Using the Repeatability Coefficient When Calculating Test-Retest Reliability
Curtin University, Australia .
Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Local Health Care Services in Central Östergötland, Habilitation in Central County. Curtin University, Australia .
Curtin University, Australia .
Curtin University, Australia .
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2013 (English)In: PLoS ONE, ISSN 1932-6203, Vol. 8, no 9Article in journal (Refereed) Published
Abstract [en]

The use of standardised tools is an essential component of evidence-based practice. Reliance on standardised tools places demands on clinicians to understand their properties, strengths, and weaknesses, in order to interpret results and make clinical decisions. This paper makes a case for clinicians to consider measurement error (ME) indices Coefficient of Repeatability (CR) or the Smallest Real Difference (SRD) over relative reliability coefficients like the Pearsons (r) and the Intraclass Correlation Coefficient (ICC), while selecting tools to measure change and inferring change as true. The authors present statistical methods that are part of the current approach to evaluate test-retest reliability of assessment tools and outcome measurements. Selected examples from a previous test-retest study are used to elucidate the added advantages of knowledge of the ME of an assessment tool in clinical decision making. The CR is computed in the same units as the assessment tool and sets the boundary of the minimal detectable true change that can be measured by the tool.

Place, publisher, year, edition, pages
Public Library of Science , 2013. Vol. 8, no 9
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-102406DOI: 10.1371/journal.pone.0073990ISI: 000326405300147OAI: diva2:677358

Funding Agencies|Centre for Research into Disability and Society||School of Occupational Therapy and Social Work, Curtin University, Perth, Australia||

Available from: 2013-12-09 Created: 2013-12-09 Last updated: 2014-08-26

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Falkmer, Torbjörn
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Division of Community MedicineFaculty of Health SciencesHabilitation in Central County
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