Validating the dental subscale of the children's fear survey schedule using Rasch analysis

Authors

  • David Lopes,

    1. Department of Psychology, University of Gothenburg, Göteborg, Sweden
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  • Kristina Arnrup,

    1. Public Dental Service, Örebro County Council, Örebro, Sweden
    2. Department of Behavioural and Community Dentistry, Institution of Odontology, The Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
    3. School of Health and Medical Sciences, Örebro University, Örebro, Sweden
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  • Agneta Robertson,

    1. Department of Pediatric Dentistry, Institute of Odontology, The Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
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  • Jesper Lundgren

    Corresponding author
    1. Research and Development Service Odontology, Public Dental Service, Region Västra Götaland, Göteborg, Sweden
    • Department of Psychology, University of Gothenburg, Göteborg, Sweden
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Jesper Lundgren, Department of Psychology, University of Gothenburg, Box 500, 405 30 Göteborg, Sweden

E-mail: jesper.lundgren@gu.se

Abstract

Rasch analysis was used to examine the validity of the Children's Fear Survey Schedule – Dental Subscale (CFSS-DS). Data were collected from parents of children in regular dental care (= 240) and from parents of children referred to a specialized pediatric dental clinic (= 200). The Rasch model is a probabilistic model in which estimations are based on the relationship between person ability and item difficulty, and the present study investigated the validity of the CFSS-DS through analysis of person and item fit, dimensionality, ordering of thresholds, local dependency, and differential item functioning. The results show multidimensionality of the original scale, and an adjusted version consisting of six items with good fit to the model is suggested. The adjusted scale makes interval-level analysis possible, and time efficiency and elimination of previously criticized items argue in favor of the adjusted scale.

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