Psychometric properties of the Disability Identity Development Scale: Confirmatory factor and bifactor analyses
Anjali J Forber-Pratt1, Larry R Price2, Gabriel J Merrin3
1Department of Human and Organizational Development.
Rehabilitation Psychology
|April 4, 2022
Summary
The Disability Identity Development Scale (DIDS) shows reasonable psychometric properties for measuring disability identity. A total score is supported, aiding clinicians and interventions in rehabilitation psychology.
Area of Science:
- Psychology
- Rehabilitation Psychology
- Disability Studies
Background:
- Disability identity is a developing area of research.
- The broad definition of disability includes visible and hidden conditions.
- Previous research defined disability broadly across various groups.
Purpose of the Study:
- To analyze the factor structure and dimensionality of the Disability Identity Development Scale (DIDS).
- To evaluate the psychometric properties of the DIDS.
- To determine the most appropriate scoring method for the DIDS.
Main Methods:
- Administered retained items from prior exploratory factor analysis to 1,126 adults with disabilities.
- Employed confirmatory factor analysis (CFA), including traditional CFA and bifactor confirmatory analyses.
- Examined the dimensionality and structure of the DIDS.
Main Results:
- Traditional CFA did not support the previously reported four-factor structure.
- Bifactor confirmatory analysis indicated that DIDS items are consistent with unidimensional solutions.
- Items lacked sufficient content diversity for a complex, reliable multifactor structure.
Conclusions:
- The DIDS demonstrates reasonable psychometric properties as a measure of disability identity.
- Results support the use of a sum or total score for disability identity.
- Findings contribute to disability identity literature and can inform clinical practice and interventions.
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