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A classical test th...
A classical test theory evaluation of the Sleep Condition Indicator accounting for the ordinal nature of item response data
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- Hellström, Amanda (author)
- Linnéuniversitetet,Institutionen för hälso- och vårdvetenskap (HV),Faculty of Health and Life Sciences, Linnaeus University, Kalmar, Sweden,Linnaeus Univ, Sweden,Linnaeus University
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- Hagell, Peter (author)
- The PRO-CARE Group, Faculty of Health Sciences, Kristianstad University, Kristianstad, Sweden,Kristianstad Univ, Sweden,Patient Reported Outcomes - Clinical Assessment Research and Education (PROCARE),Department of Nursing and Integrated Health Sciences,Avdelningen för sjuksköterskeutbildningarna och integrerad hälsovetenskap
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- Broström, Anders (author)
- Jönköping University,HHJ, Avdelningen för omvårdnad,HHJ. ADULT,Department of clinical neurophysiology, Linköping University hospital, Linköping, Sweden,Region Östergötland, Neurofysiologiska kliniken US,Jonkoping Univ, Sweden
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- Ulander, Martin (author)
- Linköpings universitet,Avdelningen för neuro- och inflammationsvetenskap,Medicinska fakulteten,Region Östergötland, Neurofysiologiska kliniken US,Linköping University
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- Luik, Annemarie I. (author)
- Univ Oxford, UK;Erasmus MC Univ Med Ctr, Netherlands,Sleep and Circadian Neuroscience Institute, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom,Univ Oxford, England; Erasmus MC Univ Med Ctr, Netherlands,University of Oxford,Erasmus University Rotterdam
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- Espie, Colin A. (author)
- Univ Oxford, UK,Sleep and Circadian Neuroscience Institute, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom,Univ Oxford, England,University of Oxford
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- Årestedt, Kristofer, 1968- (author)
- Linnéuniversitetet,Institutionen för hälso- och vårdvetenskap (HV),Region Kalmar County, Sweden,Faculty of Health and Life Sciences, Linnaeus University, Kalmar, Sweden,Linnaeus Univ, Sweden; Reg Kalmar Cty, Sweden,Linnaeus University
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(creator_code:org_t)
- 2019-03-14
- 2019
- English.
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In: PLOS ONE. - : Public Library of Science. - 1932-6203. ; 14:3, s. 1-13
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Abstract
Subject headings
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- Background Insomnia symptoms are common among young adults and affect about 5% to 26% of 19 to 34-year-olds. In addition, insomnia is associated with poor mental health and may affect daily performance. In research, as well as in clinical practice, sleep questionnaires are used to screen for and diagnose insomnia. However, most questionnaires are not developed according to current DSM-5 diagnostic criteria. An exception is the recently developed Sleep Condition Indicator (SCI), an eight-item scale screening for insomnia. Aim The aim of this study was to perform a Classical Test Theory (CTT) based psychometric evaluation of the SCI in a sample of Swedish university students, by taking the ordinal nature of item level data into account. Methods The SCI was translated into Swedish and distributed online to undergraduate students at three Swedish universities, within programs of health, psychology, science or economy. Of 3673 invited students, 634 (mean age 26.9 years; SD = 7.4) completed the questionnaire that, in addition to the SCI, comprised other scales on sleep, stress, lifestyle and students' study environment. Data were analyzed according to CTT investigating data completeness, item homogeneity and unidimensionality. Results Polychoric based explorative factor analysis suggested unidimensionality of the SCI, and internal consistency was good (Cronbach's alpha, 0.91; ordinal alpha, 0.94). SCI scores correlated with the Insomnia Severity Index (-0.88) as well as with sleep quality (-0.85) and perceived stress (-0.50), supporting external construct validity. Conclusions These observations support the integrity of the of the SCI. The SCI demonstrates sound CTT-based psychometric properties, supporting its use as an insomnia screening tool.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Annan hälsovetenskap (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Other Health Sciences (hsv//eng)
- SAMHÄLLSVETENSKAP -- Psykologi (hsv//swe)
- SOCIAL SCIENCES -- Psychology (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Neurologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Neurology (hsv//eng)
- SAMHÄLLSVETENSKAP -- Psykologi -- Psykologi (hsv//swe)
- SOCIAL SCIENCES -- Psychology -- Psychology (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Annan medicin och hälsovetenskap -- Övrig annan medicin och hälsovetenskap (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Other Medical and Health Sciences -- Other Medical and Health Sciences not elsewhere specified (hsv//eng)
Keyword
- Hälsovetenskap
- Health and Caring Sciences
Publication and Content Type
- ref (subject category)
- art (subject category)
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