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Related Experiment Videos

Testing and reducing skindex-29 using Rasch analysis: Skindex-17.

Tamar E C Nijsten1, Francesca Sampogna, Mary-Margaret Chren

  • 1Department of Dermatology, Erasmus Medical Center, Rotterdam, The Netherlands.

The Journal of Investigative Dermatology
|March 18, 2006
PubMed
Summary

The Skindex-29, a dermatology quality of life tool, was refined using Rasch analysis. The resulting Skindex-17 is a valid, shorter measure for assessing health-related quality of life in dermatology patients.

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Area of Science:

  • Dermatology
  • Psychometrics
  • Health-related quality of life (HRQOL) research

Background:

  • The Skindex-29 is a widely used instrument for measuring health-related quality of life in dermatology patients.
  • Item response theory (IRT) models, such as Rasch analysis, are valuable for evaluating and refining HRQOL instruments.
  • The original Skindex-29 did not demonstrate adequate fit to the Rasch model.

Purpose of the Study:

  • To evaluate the Skindex-29 using Rasch analysis.
  • To refine the Skindex-29 to better fit the Rasch model, improving its psychometric properties.
  • To develop a shorter, validated version of the Skindex for dermatology HRQOL assessment.

Main Methods:

  • Rasch analysis was applied to data from 454 Italian dermatological patients using the Skindex-29.

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  • The 5-point response scale was re-categorized to improve response order.
  • Subscales for psychosocial functioning and symptoms were analyzed for model fit, differential item functioning (DIF), and item misfit.

    • Main Results:

    • The original Skindex-29 did not fit the Rasch model.
    • Re-analysis after re-categorizing the response scale and combining items resulted in two subscales (psychosocial and symptoms) that fit the Rasch model.
    • The refined 17-item version, Skindex-17, demonstrated adequate classical psychometric properties and no significant DIF.

    Conclusions:

    • The Skindex-17 is a Rasch-reduced version of the Skindex-29.
    • This new version provides two independent scores for measuring HRQOL in dermatological patients.
    • Skindex-17 offers a psychometrically sound and more efficient alternative for HRQOL assessment in dermatology.