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Gepubliceerd in: Quality of Life Research 6/2019

27-02-2019

Measuring fatigue in cancer patients: a common metric for six fatigue instruments

Auteurs: Michael Friedrich, Andreas Hinz, Susanne Kuhnt, Thomas Schulte, Matthias Rose, Felix Fischer

Gepubliceerd in: Quality of Life Research | Uitgave 6/2019

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Abstract

Purpose

Fatigue is one of the most disabling symptoms in cancer patients. Many instruments exist to measure fatigue. This variety impedes the comparison of data across studies or to the general population. We aimed to estimate a common metric based on six different fatigue instruments (EORTC QLQ-C30 subscale fatigue, EORTC QLQ-FA12, MFI subscale General Fatigue, BFI, Fatigue Scale, and Fatigue Diagnostic Interview Guide) to convert the patients’ scores from one of the instruments to another. Additionally, we linked the common metric to the general population.

Methods

For n = 1225 cancer patients, the common metric was estimated using the Item Response Theory framework. The linking between the common metric of the patients and the general population was estimated using linear regression.

Results

The common metric was based on a model with acceptable fit (CFI = 0.94, SRMR = 0.06). Based on the standard error of measurement the reliability coefficients of the questionnaires ranged from 0.80 to 0.95. The common metric of the six questionnaires, also linked to the general population, is reported graphically and in supplementary crosswalk tables.

Conclusions

Our study enables researchers and clinicians to directly compare results across studies using different fatigue questionnaires and to assess the degree of fatigue with respect to the general population.
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Metagegevens
Titel
Measuring fatigue in cancer patients: a common metric for six fatigue instruments
Auteurs
Michael Friedrich
Andreas Hinz
Susanne Kuhnt
Thomas Schulte
Matthias Rose
Felix Fischer
Publicatiedatum
27-02-2019
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 6/2019
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-019-02147-3

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