Skip to main content
main-content
Top

Tip

Swipe om te navigeren naar een ander artikel

01-01-2015 | Quantitative Methods Special Section | Uitgave 1/2015

Quality of Life Research 1/2015

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

Tijdschrift:
Quality of Life Research > Uitgave 1/2015
Auteurs:
J. Twiss, S. P. McKenna

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.

Log in om toegang te krijgen

Met onderstaand(e) abonnement(en) heeft u direct toegang:

BSL Podotherapeut Totaal

Binnen de bundel kunt u gebruik maken van boeken, tijdschriften, e-learnings, web-tv's en uitlegvideo's. BSL Podotherapeut Totaal is overal toegankelijk; via uw PC, tablet of smartphone.

Literatuur
Over dit artikel

Andere artikelen Uitgave 1/2015

Quality of Life Research 1/2015 Naar de uitgave