Rasch analysis of the Nottingham Extended Activities of Daily Living Scale

Das Nair, Roshan and Moreton, Bryan and Lincoln, Nadina (2011) Rasch analysis of the Nottingham Extended Activities of Daily Living Scale. Journal of Rehabilitation Medicine, 43 (10). pp. 944-950. ISSN 1651-2081

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Background and purpose: The Nottingham Extended Activities of Daily Living (EADL) Scale is frequently used in clinical practice and research in rehabilitation to assess patients’ independence in activities of daily living. Summative scores are used for this purpose, but this is problematic because the EADL is an ordinal level measurement scale.

Objective: To examine the fit of data to the Rasch model and to determine how the fit could be improved by making changes to the scale. The appropriateness of using total and subscale (Mobility, Kitchen, Domestic and Leisure) scores in determining change over time was evaluated.

Methods: EADL data (n = 210 stroke patients, 55% male, age range 27–93 years) from a randomized trial of a Stroke family support organiser service were analysed using the Partial Credit model.

Results: Rasch analysis did not support the total scale as a unidimensional measure of activities of daily living. However, the subscales exhibited reasonable fit to the Rasch model following re-scoring and removal of items. Item 16 exhibited differential item functioning for age and item 22 differential item functioning for gender.

Conclusion: The results endorse the use and psychometric properties of the 4 EADL subscales, but not the total scale. Further work to corroborate these findings would be useful

Item Type: Article
Keywords: Rasch analysis; Stroke rehabilitation; Disability; Activities of daily living; Outcome assessment
Schools/Departments: University of Nottingham UK Campus > Faculty of Social Sciences > Institute of Work, Health and Organization
University of Nottingham UK Campus > Faculty of Medicine and Health Sciences > School of Medicine > Division of Rehabilitation and Ageing
Identification Number: https://doi.org/10.2340/16501977-0858
Depositing User: Dziunka, Patricia
Date Deposited: 27 Jun 2016 08:27
Last Modified: 24 Sep 2016 16:47
URI: http://eprints.nottingham.ac.uk/id/eprint/34379

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