Rasch model of the Child Perceptions Questionnaire in multi-country data

Tanja Stamm, Sarah R. Baker, L A Foster Page, W Murray Thomson, Philip Benson, Tom Broomhead, F Aguilar-Diaz, Loc Do, Barry John Gibson, Christian Hirsch, Zoe Marshman, Colman McGrath, A Mohamed, Peter G Robinson, Jefferson Traebert, Beth Turton, Thomas Salzberger, Katrin Bekes

Research output: Contribution to journalArticle (Academic Journal)

Abstract

Objective: To be fit-for-purpose, oral health-related quality of life instruments must possess a range of psychometric properties which had not been fully examined in the 16-item Short Form Child Perceptions Questionnaire for children aged 11 to 14 years (CPQ11-14 ISF-16). We used advanced statistical approaches to determine the CPQ’s measurement accuracy, precision, invariance and dimensionality and analyzed whether age range could be extended from 8 to 15 years.
Methods: Fit to the Rasch model was examined in 6648 8-to-15-year-olds from Australia, New Zealand, Brunei, Cambodia, Hong Kong, Malaysia, Thailand, Germany, United Kingdom, Brazil and Mexico.
Results: In all but two items, the initial five answer options were reduced to three or four, to increase precision of the children’s selection. Items 10 (Shy/embarrassed) and 11 (Concerned what others think) showed an ‘extra’ dependency between item scores beyond the relationship related to the underlying latent construct represented by the instrument, and so were deleted. Without these two items, the CPQ was unidimensional. The three oral symptoms items (4 Food stuck in teeth, 3 Bad breath and 1 Pain) were required for a sufficient person-item coverage. In three out of 14 items (21%), Europe and South America showed regional differences in the patterns of how the answer options were selected. No differential item functioning was detected for age.
Conclusion: Except for a few modifications, the present analysis supports the combination of items, the cross-cultural validity of the CPQ with 14 items and the extension of the age range from 8 to 15 years.
Original languageEnglish
Article number103267
Number of pages7
JournalJournal of Dentistry
Early online date19 Dec 2019
DOIs
Publication statusE-pub ahead of print - 19 Dec 2019

Keywords

  • Patient-reported outcome measures
  • Measurement accuracy
  • Cross-border care
  • Psychometric properties
  • Item response theory

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