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

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• 作者：Martijn B. A. van der Wal (1) (2) (3)
  Wim E. Tuinebreijer (1)
  ?sa Lundgren-Nilsson (4)
  Esther Middelkoop (1) (2) (3)
  Paul P. M. van Zuijlen (1) (2) (3) (5)
  
• 关键词：Differential item functioning ; POSAS ; Rasch ; Scar quality ; Scar assessment
• 刊名：Quality of Life Research
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：23
• 期：7
• 页码：2037-2045
• 全文大小：427 KB
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• 作者单位：Martijn B. A. van der Wal (1) (2) (3)
  Wim E. Tuinebreijer (1)
  ?sa Lundgren-Nilsson (4)
  Esther Middelkoop (1) (2) (3)
  Paul P. M. van Zuijlen (1) (2) (3) (5)
  
  1. Association of Dutch Burn Centers, Beverwijk, The Netherlands
  2. Burn Center, Red Cross Hospital, Beverwijk, The Netherlands
  3. Department of Plastic, Reconstructive, and Hand Surgery, VU Medical Center, Amsterdam, The Netherlands
  4. Department of Clinical Neuroscience and Rehabilitation, Institute of Neuroscience and Physiology, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
  5. Department of Plastic, Reconstructive, and Hand Surgery, Red Cross Hospital, Vondellaan 13, 1942 LE, Beverwijk, The Netherlands
  
• ISSN：1573-2649

文摘

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.