Ordinal-to-interval scale conversion tables and national items for the New Zealand version of the WHOQOL-BREF

Journal article


Krägeloh, C. U., Billington, D. R., Hsien-Chuan Hsu, P., Feng, X. J., Medvedev, O. N., Kersten, P., Landon, J. and Siegert, R. J. 2016. Ordinal-to-interval scale conversion tables and national items for the New Zealand version of the WHOQOL-BREF. PLoS ONE. 11 (11). https://doi.org/10.1371/journal.pone.0166065
AuthorsKrägeloh, C. U., Billington, D. R., Hsien-Chuan Hsu, P., Feng, X. J., Medvedev, O. N., Kersten, P., Landon, J. and Siegert, R. J.
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.

KeywordsWHOQOL; World Health Organisation Quality of Life questionnaires
Year2016
JournalPLoS ONE
Journal citation11 (11)
PublisherPublic Library of Science
ISSN1932-6203
Digital Object Identifier (DOI)https://doi.org/10.1371/journal.pone.0166065
Official URLhttps://journals.plos.org/plosone/article?id=10.1371/journal.pone.0166065
Publication dates
Online03 Nov 2016
Publication process dates
Accepted22 Oct 2016
Deposited21 Apr 2022
Publisher's version
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Open
Output statusPublished
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