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

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 existin g 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 i nterpreted as 'disability'. The reliability of the solutions was satisfacto ry (0.88 for walking and 0.91 for dressing). Conclusion: Based on the results, tentatively a new severity code is propos ed with more distinct categories of 'difficulty' than the existing code, an d the use of technical aids and personal assistance in the higher ranks. Th e Rasch method could be a useful tool for calibrating and measuring disabil ity, as well as for converting existing disability data into a new uniform severity of disability code.