Validating independent ratings of executive functioning following acquired brain injury using Rasch analysis

Sara K Simblett, Rachel Badham, Kate Greening, Anna Adlam, Howard Ring, Andrew Bateman

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11 Citations (Scopus)


Assessment of everyday problems with executive functioning following acquired brain injury (ABI) is greatly valued by neurorehabilitation services. Reliance on self-report measures alone is problematic within this client group who may experience difficulties with awareness and memory. The construct validity and reliability of independent ratings (i.e., ratings provided by a carer/relative) on the Dysexecutive Questionnaire (DEX-I) was explored in this study. Consistent with the results recently reported on the self-rated version of the DEX (DEX-S; Simblett & Bateman, 2011 ), Rasch analysis completed on 271 responses to the DEX-I revealed that the scale did not fit the Rasch model and did not meet the assumption of unidimensionality, that is, a single underlying construct could not be found for the DEX-I that would allow development of an interval-level measure as a whole. Subscales, based on theoretical conceptualisations of executive functioning (Stuss, 2007 ) previously suggested for the DEX-S, were able to demonstrate fit to the Rasch model and unidimensionality. Reliability of independent responses to these subscales in comparison to self-reported ratings is discussed. These results contribute to a greater understanding of how assessment of executive functioning can be improved.
Original languageEnglish
Pages (from-to)874-889
Number of pages16
JournalNeuropsychological Rehabilitation
Issue number6
Publication statusPublished - Dec 2012


  • Severity of Illness Index
  • Questionnaires
  • Reproducibility of Results
  • Chi-Square Distribution
  • Humans
  • Longitudinal Studies
  • Cognition Disorders
  • Disability Evaluation
  • Statistics as Topic
  • Executive Function
  • Brain Injuries
  • Neuropsychological Tests
  • Female
  • Male

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