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Quality of Life Research
Gepubliceerd in:

01-02-2015

Examining unidimensionality and improving reliability for the eight subscales of the SF-36 in opioid-dependent patients using Rasch analysis

Auteurs: Yu-Yu Hsiao, Ching-Lin Shih, Wan-Hui Yu, Cheng-Hsi Hsieh, Ching-Lin Hsieh

Gepubliceerd in: Quality of Life Research | Uitgave 2/2015

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Abstract

Purpose

The Medical Outcome Study Short Form 36 (SF-36) is one of the most commonly used questionnaires for monitoring the Health-Related Quality of Life (HRQOL) of opioid-dependent patients. However, the unidimensionality and reliability of the SF-36 have not been verified in opioid-dependent patients. The aim of this study was to examine the unidimensionality and to improve the test reliability of the SF-36 for use in opioid-dependent patients.

Methods

A total of 583 opioid-dependent patients were recruited in the study. Unidimensionality was examined by conducting unidimensional Rasch analysis. Item fit statistics and principle component analysis were used to check the item-model fit in each of the eight subscales of the SF-36. Reliability was evaluated by applying both unidimensional and multidimensional Rasch analyses.

Results

After three misfitting items were excluded, the remaining items of each subscale in the SF-36 represented a single construct. The test reliabilities (0.80–0.87) yielded by the multidimensional approach were much higher than those (0.68–0.82) produced by the unidimensional approach.

Conclusion

The remaining 32 items of the SF-36 are appropriate for evaluating the HRQOL in opioid-dependent patients in terms of unidimensionality. Additionally, the test scores produced by the multidimensional approach were more accurate than those obtained by the unidimensional approach.
vorige artikel Pooling of cross-cultural PRO data in multinational clinical trials: How much can poor measurement affect statistical power?
volgende artikel Combination of classical test theory (CTT) and item response theory (IRT) analysis to study the psychometric properties of the French version of the Quality of Life Enjoyment and Satisfaction Questionnaire-Short Form (Q-LES-Q-SF)
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Metagegevens
Titel
Examining unidimensionality and improving reliability for the eight subscales of the SF-36 in opioid-dependent patients using Rasch analysis
Auteurs
Yu-Yu Hsiao
Ching-Lin Shih
Wan-Hui Yu
Cheng-Hsi Hsieh
Ching-Lin Hsieh
Publicatiedatum
01-02-2015
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 2/2015
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-014-0771-z

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