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The Disability Identity Development Scale (DIDS) demonstrates strong validity and reliability for measuring disability identity. This research confirms its structure and usefulness for understanding disability identity development.

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Area of Science:

  • Psychology
  • Disability Studies
  • Sociology

Background:

  • The Disability Identity Development Scale (DIDS) is a key measure for assessing disability identity.
  • Previous research highlighted the DIDS's rigorous scale development but lacked detailed item fit analysis.

Purpose of the Study:

  • To evaluate the construct validity of DIDS scores using item response theory (IRT) and confirmatory factor analysis (CFA).
  • To examine the convergent validity of DIDS scores with related psychological constructs.
  • To determine the reliability of individual DIDS factors.

Main Methods:

  • Utilized IRT and CFA on data from 210 undergraduate students with disabilities.
  • Employed Rasch IRT framework, CFA, Omega reliability, and correlational analyses.
  • Included the DIDS, University Belongingness Questionnaire, and College Self-Efficacy Inventory.

Main Results:

  • IRT and CFA confirmed a 36-item, four-factor DIDS structure.
  • Identified specific item difficulties within the 'adoption of disability community values' and 'contribution to the disability community' factors.
  • Demonstrated strong reliability for all DIDS factors and provided evidence for convergent and discriminant validity.

Conclusions:

  • The findings validate the DIDS as a robust measure for disability identity development.
  • Results support Forber-Pratt's psychosocial model of disability identity.
  • The study advances the research, measurement, and practical application of disability identity development.