A classical test theory evaluation of the Sleep Condition Indicator accounting for the ordinal nature of item response data

• Amanda Hellström ,

  Roles Conceptualization, Investigation, Methodology, Project administration, Writing – original draft

  * E-mail: amanda.hellstrom@lnu.se

  Affiliation Faculty of Health and Life Sciences, Linnaeus University, Kalmar, Sweden

  http://orcid.org/0000-0001-8398-9552

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• Peter Hagell,

  Roles Conceptualization, Methodology, Writing – original draft, Writing – review & editing

  Affiliation The PRO-CARE Group, Faculty of Health Sciences, Kristianstad University, Kristianstad, Sweden

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• Anders Broström,

  Roles Conceptualization, Writing – review & editing

  Affiliations School of Health and Welfare, Jönköping University, Jönköping, Sweden, Department of clinical neurophysiology, Linköping University hospital, Linköping, Sweden

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• Martin Ulander,

  Roles Writing – review & editing

  Affiliations Department of clinical neurophysiology, Linköping University hospital, Linköping, Sweden, Division of Neurosciences and Inflammation Research, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden

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• Annemarie I. Luik,

  Roles Conceptualization, Writing – review & editing

  Affiliations Sleep and Circadian Neuroscience Institute, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom, Department of Epidemiology, Erasmus MC University Medical Center, Rotterdam, Netherlands

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• Colin A. Espie,

  Roles Writing – review & editing

  Affiliation Sleep and Circadian Neuroscience Institute, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom

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• Kristofer Årestedt

  Roles Conceptualization, Investigation, Methodology, Writing – original draft, Writing – review & editing

  Affiliations Faculty of Health and Life Sciences, Linnaeus University, Kalmar, Sweden, The Research Section, Region Kalmar County, Kalmar, Sweden

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