Polytomous Rasch analysis as a tool for revision of the severity of disability code of the ICIDH

Marijke Hopman-Rock*, Stef Van Buuren, Marijke De Kleijn-De Vrankrijker

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Purpose: To develop a preliminary proposal for the revision of the severity code of the ICIDH-D 1980. Method: Quantitative analysis (polytomous Rasch analysis) of linked existing data sources including items about walking and dressing disability. Results: The Rasch analysis provided estimates of threshold parameters for walking and dressing item categories. Factor analysis showed that more than one dimension was present, but that the first factor could definitely be interpreted as 'disability'. The reliability of the solutions was satisfactory (0.88 for walking and 0.91 for dressing). Conclusion: Based on the results, tentatively a new severity code is proposed with more distinct categories of 'difficulty' than the existing code, and the use of technical aids and personal assistance in the higher ranks. The Rasch method could be a useful tool for calibrating and measuring disability, as well as for converting existing disability data into a new uniform severity of disability code.

Original languageEnglish
Pages (from-to)363-371
Number of pages9
JournalDisability and Rehabilitation
Volume22
Issue number8
Publication statusPublished - 20 May 2000

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