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Quality of Life Research
Gepubliceerd in:

01-01-2015 | Quantitative Methods Special Section

Comparing the impact of psoriasis and atopic dermatitis on quality of life: co-calibration of the PSORIQoL and QoLIAD

Auteurs: J. Twiss, S. P. McKenna

Gepubliceerd in: Quality of Life Research | Uitgave 1/2015

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Abstract

Background

Disease-specific patient-reported outcome (PRO) measures are designed to be highly relevant to one disease. It is widely believed that comparisons of outcomes between patients with different diseases are only possible using generic measures. The present study employs a novel method of using Rasch analysis to co-calibrate scores from different disease-specific PRO measures, allowing scores to be compared across diseases.

Methods

Psoriasis patients (n = 146, mean age = 44.4, males = 50 %) completed the Psoriasis Quality of Life scale (PSORIQoL) and atopic dermatitis patients (n = 146, mean age = 45.5, males = 50 %) the Quality of Life in Atopic Dermatitis scale (QoLIAD). Both measures employ the needs-based model of QoL, and they share five common items—providing a link between assessments. The groups were analysed separately, and then combined to test fit to the Rasch model.

Results

Both scales showed good fit to the Rasch model after minor adjustments (PSORIQoL: χ 2 p = 0.25; QoLIAD: χ 2 p = 0.51). For the combined dataset, one common item showing differential item functioning by disease was removed and fit to the Rasch model was achieved (χ 2 p = 0.08). The co-calibrated scale successfully distinguished between perceived severity groups (p < 0.001).

Conclusions

It is possible to co-calibrate scores on the PSORIQoL and QoLIAD. This is one of the first studies in health research to demonstrate how Rasch analysis can be used to make comparisons across diseases using different disease-specific measures. Such an approach maintains the greater relevance and, consequently, accuracy associated with disease-specific measurement.
vorige artikel Quantifying ‘problematic’ DIF within an IRT framework: application to a cancer stigma index
volgende artikel Using quantitative methods within the Universalist model framework to explore the cross-cultural equivalence of patient-reported outcome instruments
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Metagegevens
Titel
Comparing the impact of psoriasis and atopic dermatitis on quality of life: co-calibration of the PSORIQoL and QoLIAD
Auteurs
J. Twiss
S. P. McKenna
Publicatiedatum
01-01-2015
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 1/2015
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-014-0630-y

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