The Washington Psychosocial Seizure Inventory (WPSI): Psychometric evaluation and future applications

Chih Hung Chang*, Sarah Gehlert

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The Washington Psychosocial Seizure Inventory (WPSI) clinical scales were developed via an empirical item selection approach and have been used widely to measure aspects of psychosocial functioning of patients with epilepsy. However, these empirically derived clinical scales have not been assessed psychometrically using a modern item response theory-based model. The goals of this study were to: (1) evaluate how items in each clinical scale performed in such a way as to represent the underlying constructs being measured; and (2) derive a shorter version while maintaining measurement precision. WPSI item response data from 145 adults with epilepsy collected for an evaluation study of an intervention to pact negative attributional style in epilepsy were used. The dichotomous Rasch model suitable for the true-false response choices was used to analyse each clinical scale separately. Most items within each scale fit the measurement model well, with very few exceptions. All items, therefore, were retained. A method, based on computerised adaptive testing (CAT), is offered for shortening the WPSI using a psychosocial outcomes item bank derived from the study. Individuals' specific levels of functioning are used to derive measures of their psychosocial functioning with a minimum number of items.

Original languageEnglish (US)
Pages (from-to)261-267
Number of pages7
JournalSeizure
Volume12
Issue number5
DOIs
StatePublished - Jul 2003

Keywords

  • Computerised adaptive testing
  • Item response theory
  • Psychometrics
  • Washington Psychosocial Seizure Inventory

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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