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Quality of Life Research
Gepubliceerd in: Quality of Life Research 7/2014

01-09-2014

Differential item functioning in the Observer Scale of the POSAS for different scar types

Auteurs: Martijn B. A. van der Wal, Wim E. Tuinebreijer, Åsa Lundgren-Nilsson, Esther Middelkoop, Paul P. M. van Zuijlen

Gepubliceerd in: Quality of Life Research | Uitgave 7/2014

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Abstract

Purpose

To investigate whether the Observer Scale of the Patient and Observer Scar Assessment Scale (POSAS) can serve as a generic measure for scar quality across different scar types.

Methods

A collection of POSAS scores derived from several clinical trials on burn (n = 404), linear (n = 384), and keloidal scars (n = 282) was analyzed using the partial credit model of the Rasch analysis package RUMM2030.

Results

Differential item functioning (DIF) was observed for the Observer Scale of the POSAS between the three scar types for the items pliability, thickness, and surface area, which could be solved by item splitting. The items pigmentation and thickness showed disordered thresholds, considerable misfit, and unpredictability.

Conclusion

Users of the Observer Scale of the POSAS must be aware that the raw scores obtained from burn, linear, and keloidal scars cannot be compared without the scar-specific DIF adjustment of the items pliability, thickness, and surface area.
vorige artikel Comparing PROMIS computer-adaptive tests to the Brief Symptom Inventory in patients with prostate cancer
volgende artikel Measuring health-related quality of life: psychometric evaluation of the Tunisian version of the SF-12 health survey
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Metagegevens
Titel
Differential item functioning in the Observer Scale of the POSAS for different scar types
Auteurs
Martijn B. A. van der Wal
Wim E. Tuinebreijer
Åsa Lundgren-Nilsson
Esther Middelkoop
Paul P. M. van Zuijlen
Publicatiedatum
01-09-2014
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 7/2014
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-014-0637-4

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