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Ordinal-To-Interval Scale Conversion Tables and National Items for the New Zealand Version of the WHOQOL-BREF

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  • Christian U Krägeloh
  • D Rex Billington
  • Patricia Hsien-Chuan Hsu
  • Xuan Joanna Feng
  • Oleg N Medvedev
  • Paula Kersten
  • Jason Landon
  • Richard J Siegert

Abstract

The World Health Organisation Quality of Life (WHOQOL) questionnaires are widely used around the world and can claim strong cross-cultural validity due to their development in collaboration with international field centres. To enhance conceptual equivalence of quality of life across cultures, optional national items are often developed for use alongside the core instrument. The present study outlines the development of national items for the New Zealand WHOQOL-BREF. Focus groups with members of the community as well as health experts discussed what constitutes quality of life in their opinion. Based on themes extracted of aspects not contained in the existing WHOQOL instrument, 46 candidate items were generated and subsequently rated for their importance by a random sample of 585 individuals from the general population. Applying importance criteria reduced these items to 24, which were then sent to another large random sample (n = 808) to be rated alongside the existing WHOQOL-BREF. A final set of five items met the criteria for national items. Confirmatory factor analysis identified four national items as belonging to the psychological domain of quality of life, and one item to the social domain. Rasch analysis validated these results and generated ordinal-to-interval conversion algorithms to allow use of parametric statistics for domain scores with and without national items.

Suggested Citation

  • Christian U Krägeloh & D Rex Billington & Patricia Hsien-Chuan Hsu & Xuan Joanna Feng & Oleg N Medvedev & Paula Kersten & Jason Landon & Richard J Siegert, 2016. "Ordinal-To-Interval Scale Conversion Tables and National Items for the New Zealand Version of the WHOQOL-BREF," PLOS ONE, Public Library of Science, vol. 11(11), pages 1-15, November.
    • Handle: RePEc:plo:pone00:0166065
    DOI: 10.1371/journal.pone.0166065
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    References listed on IDEAS

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    1. The Whoqol Group, 1998. "The World Health Organization quality of life assessment (WHOQOL): Development and general psychometric properties," Social Science & Medicine, Elsevier, vol. 46(12), pages 1569-1585, June.
    2. Skevington, S. M. & Bradshaw, J. & Saxena, S., 1999. "Selecting national items for the WHOQOL: conceptual and psychometric considerations," Social Science & Medicine, Elsevier, vol. 48(4), pages 473-487, February.
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