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A Polytomous Rasch Analysis of the English Version of Health-Related Quality of Life for Drug Abusers Test

Published online by Cambridge University Press:  03 June 2015

Oscar M. Lozano ,
Antonio J. Rojas Tejada ,
Katia Foresti  and
Carlos Zubaran
Oscar M. Lozano
Affiliation:
Universidad de Huelva (Spain)
Antonio J. Rojas Tejada*
Affiliation:
Universidad de Almería (Spain)
Katia Foresti
Affiliation:
Nepean Hospital (Australia)
Carlos Zubaran
Affiliation:
University of Western Sydney (Australia)
*
*Correspondence concerning this article should be addressed to Dr. Antonio J. Rojas Tejada. Departamento de Psicología. Universidad de Almería. 04120. Almería (Spain). Phone: +34–950015538. E-mail: arojas@ual.es
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Abstract

The specific aim of this study was to analyze the psychometric properties of the English version of the Health-Related Quality of Life for Drug Abusers Test (HRQoLDA Test) applying the Rasch model, and emphasizing fit between empirical data and theoretical Rasch model assumptions; item(s) category probability curve; and precision in terms of information function. In this study, the authors present the results of the translation and adaptation of the original Spanish version to English, as applied to a sample of substance users in Australia. The authors evaluated 121 adults recruited from inpatient and outpatient treatment facilities in Sydney, Australia. The Rating Scale Model was used in the psychometric analysis of the English version of the HRQoLDA Test. The items and persons revealed a fit between the reported data and the model. It was also demonstrated that respondents did not discriminate among the five response categories, which led to a reduction to three response categories. The adaptation of the TECVASP to the English language, renamed the HRQoLDA test, as developed with an Australian sample revealed adequate psychometric properties.

Keywords

quality of lifepsychometrics analysissubstance use disordersaddictions
Type
Research Article
Information
The Spanish Journal of Psychology , Volume 18 , 2015 , E31
Copyright
Copyright © Universidad Complutense de Madrid and Colegio Oficial de Psicólogos de Madrid 2015 

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