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The fairness of the Epworth Sleepiness Scale: two approaches to differential item functioning
Linnaeus University, Faculty of Health and Life Sciences, Department of Health and Caring Sciences.ORCID iD: 0000-0002-0961-5250
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2013 (English)In: Sleep and Breathing, ISSN 1520-9512, E-ISSN 1522-1709, Vol. 17, no 1, 157-165 p.Article in journal (Refereed) Published
Abstract [en]

Differential item functioning (DIF) is said to exist in an item if a subject's response to the item is affected by other aspects than that which the test is intended to assess. DIF might affect the validity of a test. The aim of this study was thus to examine whether any of the items in the Epworth Sleepiness Scale (ESS) exhibits DIF regarding age or gender, and if so, to which degree. Using previously collected cross-sectional ESS data from 1,168 subjects with different clinical characteristics (61% males, mean age 67.8 year (SD 12.2 year)), ordinal regression as well as Rasch-based DIF analyses were performed. Concerning age, both DIF analyses showed DIF for age in items 3 (inactive in a public place), 4 (passenger in a car), and 8 (in a car that has stopped in traffic). The Rasch model also showed DIF for gender in item 3. The DIF magnitudes as judged by McFadden pseudo-R (2) changes were, however, only minor. ESS has small but reproducible DIF for age in items 3, 4, and 8. The detected DIF might be worth to consider in large-sample studies, although it probably has no effect on an individual basis.

Place, publisher, year, edition, pages
2013. Vol. 17, no 1, 157-165 p.
Keyword [en]
Epworth Sleepiness Scale, Differential item functioning, Sleep, Daytime sleepiness
National Category
Nursing
Research subject
Health and Caring Sciences, Nursing
Identifiers
URN: urn:nbn:se:lnu:diva-24859DOI: 10.1007/s11325-012-0664-8ISI: 000315167200029OAI: oai:DiVA.org:lnu-24859DiVA: diva2:612558
Available from: 2013-03-22 Created: 2013-03-22 Last updated: 2016-10-26Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf