Articlegold2015

Differential item functioning (DIF) of SF-12 and Q-LES-Q-SF items among french substance users

Stéphanie Bourion-Bédès · Raymund Schwan · Vincent Laprévote · Alex Bédès · Jean-Louis Bonnet · Cédric Baumann

39 citations0/0 files storedHealth and Quality of Life Outcomes

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Psychometric Methodologies and Testing Health Systems, Economic Evaluations, Quality of Life Health Education and Validation

Abstract

BACKGROUND: Differential Item Functioning (DIF) is investigated to ensure that each item displays a consistent pattern of responses irrespective of the characteristics of the respondents. Assessing DIF helps to understand the nature of instruments, to assess the quality of a measure and to interpret results. This study aimed to examine whether the items of the Quality of Life Enjoyment and Satisfaction Questionnaire-Short Form (Q-LES-Q-SF) and Short-Form 12 (SF-12) exhibit DIF. METHOD: A total of 124 outpatients diagnosed with substance dependence participated in a cross-sectional, multicenter study. In addition to the Q-LES-Q-SF and SF-12 results, demographic data such as age, sex, type of substance dependence and education level were collected. Rasch analysis was conducted (using RUMM2020 software) to assess DIF of the Q-LES-Q-SF and SF-12 items. RESULTS: For SF-12, significant age-related uniform DIF was found in two of the 12 items, and sex-related DIF was found in one of the 12 items. All of the observed DIF effects in SF-12 were found among the mental health items. Three items showed DIF on the Q-LES-Q-SF; however, the impact of DIF item on the delta score calculation for the comparisons of self-reported health status between the groups was minimal in the SF-12 and small in the Q-LES-Q-SF. CONCLUSION: These results indicated that no major measurement bias affects the validity of the self-reported health status assessed using the Q-LES-Q-SF or SF-12. Thus, these questionnaires are largely robust measures of self-reported health status among substance users.

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References

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2018Factor structure of the Q-LES-Q short form in an enrolled mental health clinic population 2019Distributional Regression Techniques in Socioeconomic Research on the Inequality of Health with an Application on the Relationship between Mental Health and Income

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