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Gepubliceerd in: Quality of Life Research 4/2018

16-11-2017

Measurement invariance of the WHOQOL-AGE questionnaire across three European countries

Auteurs: David Santos, Francisco J. Abad, Marta Miret, Somnath Chatterji, Beatriz Olaya, Katarzyna Zawisza, Seppo Koskinen, Matilde Leonardi, Josep Maria Haro, José Luis Ayuso-Mateos, Francisco Félix Caballero

Gepubliceerd in: Quality of Life Research | Uitgave 4/2018

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Abstract

Purpose

Developing valid and reliable instruments that can be used across countries is necessary. The present study aimed to test the comparability of quality of life scores across three European countries (Finland, Poland, and Spain).

Method

Data from 9987 participants interviewed between 2011 and 2012 were employed, using nationally representative samples from the Collaborative Research on Ageing in Europe project. The WHOQOL-AGE questionnaire is a 13-item test and was employed to assess the quality of life in the three considered countries. First of all, two models (a bifactor model and a two-correlated factor model) were proposed and tested in each country by means of confirmatory factor models. Second, measurement invariance across the three countries was tested using multi-group confirmatory factor analysis for that model which showed the best fit. Finally, differences in latent mean scores across countries were analyzed.

Results

The results indicated that the bifactor model showed more satisfactory goodness-of-fit indices than the two-correlated factor model and that the WHOQOL-AGE questionnaire is a partially scalar invariant instrument (only two items do not meet scalar invariance). Quality of life scores were higher in Finland (considered as the reference category: mean = 0, SD = 1) than in Spain (mean = − 0.547, SD = 1.22) and Poland (mean = − 0.927, SD = 1.26).

Conclusions

Respondents from Finland, Poland, and Spain attribute the same meaning to the latent construct studied, and differences across countries can be due to actual differences in quality of life. According to the results, the comparability across the different considered samples is supported and the WHOQOL-AGE showed an adequate validity in terms of cross-country validation. Caution should be exercised with the two items which did not meet scalar invariance, as potential indicator of differential item functioning.
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Metagegevens
Titel
Measurement invariance of the WHOQOL-AGE questionnaire across three European countries
Auteurs
David Santos
Francisco J. Abad
Marta Miret
Somnath Chatterji
Beatriz Olaya
Katarzyna Zawisza
Seppo Koskinen
Matilde Leonardi
Josep Maria Haro
José Luis Ayuso-Mateos
Francisco Félix Caballero
Publicatiedatum
16-11-2017
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 4/2018
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-017-1737-8

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