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The SF–8 Spanish Version for Health-Related Quality of Life Assessment: Psychometric Study with IRT and CFA Models

Published online by Cambridge University Press:  22 March 2018

José M. Tomás ,
Laura Galiana  and
Irene Fernández
José M. Tomás
Affiliation:
Universidad de Valencia (Spain).
Laura Galiana*
Affiliation:
Universidad de Valencia (Spain).
Irene Fernández
Affiliation:
Universidad de Valencia (Spain).
*
*Correspondence concerning this article should be addressed to Laura Galiana. Departamento de Metodología de las Ciencias del Comportamiento de la Universidad de Valencia. (Spain). E-mail: [email protected]
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Abstract

The aim of current research is to analyze the psychometric properties of the Spanish version of the SF–8, overcoming previous shortcomings. A double line of analyses was used: competitive structural equations models to establish factorial validity, and Item Response theory to analyze item psychometric characteristics and information. 593 people aged 60 years or older, attending long life learning programs at the University were surveyed. Their age ranged from 60 to 92 years old. 67.6% were women. The survey included scales on personality dimensions, attitudes, perceptions, and behaviors related to aging. Competitive confirmatory models pointed out two-factors (physical and mental health) as the best representation of the data: χ2(13) = 72.37 (p < .01); CFI = .99; TLI = .98; RMSEA = .08 (.06, .10). Item 5 was removed because of unreliability and cross-loading. Graded response models showed appropriate fit for two-parameter logistic model both the physical and the mental dimensions. Item Information Curves and Test Information Functions pointed out that the SF–8 was more informative for low levels of health. The Spanish SF–8 has adequate psychometric properties, being better represented by two dimensions, once Item 5 is removed. Gathering evidence on patient-reported outcome measures is of crucial importance, as this type of measurement instruments are increasingly used in clinical arena.

Keywords

Item Response theory (IRT)Patient-reported outcome measures (PROMs)Short Form-8 Health Survey Questionnaire (SF–8)Structural Equation Modeling (SEM)
Type
Research Article
Information
The Spanish Journal of Psychology , Volume 21 , 2018 , E1
Copyright
Copyright © Universidad Complutense de Madrid and Colegio Oficial de Psicólogos de Madrid 2018 

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Footnotes

This research has been funded by the Project PSI2014-53280-R: Estudio Longitudinal del Envejecimiento Exitoso en Personas Mayores en Programas de Aprendizaje a lo Largo de la Vida: Impacto Sobre el Bienestar Biopsicosocial.

How to cite this article:

Tomás, J. M., Galiana, L., & Fernández, I. (2018). The SF–8 Spanish version for Health-Related Quality of Life Assessment: Psychometric study with IRT and CFA models. The Spanish Journal of Psychology, 21. e1. Doi:10.1017/sjp.2018.4

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