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Categorization of Skindex-29 scores using mixture analysis.
Tamar Nijsten1, Francesca Sampogna, Damiano Abeni
1Department of Dermatology, Erasmus MC, Rotterdam, The Netherlands.
Dermatology (Basel, Switzerland)
|December 9, 2008
Summary
This study categorizes Skindex-29 scores for better interpretation of patient quality of life in dermatology. New score categories help clinicians understand the impact of skin diseases on patients.
Area of Science:
- Dermatology
- Psychometrics
- Health Outcomes Research
Background:
- The Skindex-29 is a widely used health-related quality of life instrument in dermatology.
- Interpretation of Skindex-29 scores is not well-documented, hindering clinical application.
Purpose of the Study:
- To develop distinct categories for Skindex-29 scores.
- To improve the interpretability of Skindex-29 results for clinicians and researchers.
Main Methods:
- Analysis of Skindex-29 scores from 454 Italian patients with diverse skin conditions.
- Application of mixture analyses to identify score categories.
- Validation of the derived categorizations.
Main Results:
- Mixture analysis identified 4 categories for the emotion/functioning scale and 5 for the symptom scale.
- The total Skindex-29 score was divided into 4 distinct levels.
- Patients with inflammatory diseases showed higher impairment; vitiligo/alopecia areata patients had low symptom levels; nevi patients were in lower categories.
Conclusions:
- The proposed Skindex-29 score categories facilitate the interpretation of continuous scores.
- These categories can aid in assessing the impact of skin diseases on quality of life.
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