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Gepubliceerd in: Quality of Life Research 1/2014

01-02-2014

Testing the measurement equivalence of paper and interactive voice response system versions of the EORTC QLQ-C30

Auteurs: J. Jason Lundy, Stephen Joel Coons, Neil K. Aaronson

Gepubliceerd in: Quality of Life Research | Uitgave 1/2014

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Abstract

Purpose

The objective of this study was to evaluate the measurement equivalence of an interactive voice response system (IVRS) version and the original paper-based version of the EORTC QLQ-C30.

Methods

The QLQ-C30 is a cancer-specific, health-related quality of life questionnaire consisting of nine multi-item scales (physical, role, emotional, cognitive and social functioning, fatigue, nausea/vomiting, pain, and quality of life) and six single item measures (dyspnea, insomnia, appetite loss, constipation, diarrhea, and financial problems). This study utilized a crossover design with subjects randomly assigned to one of two assessment orders: (1) paper then IVRS or (2) IVRS then paper. Equivalence between the two administration modes was established by comparing the 95 % lower confidence interval (CI) of the intraclass correlation coefficients (ICCs) for each scale, with a critical value of 0.70.

Results

The ICCs for the nine multi-item scales were all above 0.79, ranging from 0.791 to 0.899 (ICC 95 % lower CI range 0.726–0.865) and significantly different from our threshold reliability of 0.70. The ICCs for the six single items ranged from 0.689 to 0.896 (ICC 95 % lower CI range 0.611–0.888). Two of the items, insomnia and appetite loss, were not statistically different from 0.70. When considered together, the per-protocol analysis results support the equivalence of the paper and IVRS versions of the QLQ-C30 for 13 of the 15 scores.

Conclusion

This analysis provides evidence that the scores obtained from the IVRS version of the QLQ-C30 are equivalent to those obtained with the original paper version except for the insomnia and appetite loss items.
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Metagegevens
Titel
Testing the measurement equivalence of paper and interactive voice response system versions of the EORTC QLQ-C30
Auteurs
J. Jason Lundy
Stephen Joel Coons
Neil K. Aaronson
Publicatiedatum
01-02-2014
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 1/2014
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-013-0454-1