Testing and reducing Skindex-29 using rasch analysis: Skindex-17

Tamar E C Nijsten, Francesca Sampogna, Mary Margaret Chren, Damiano D. Abeni

Research output: Contribution to journalArticlepeer-review


The Skindex is a well-studied dermatology-specific health-related quality of life (HRQOL) instrument. The objective of this study was to test Skindex-29 using Rasch analysis and, if necessary, to refine it so that it would fit this item response theory based model. The Skindex-29 of 454 Italian dermatological patients was subjected to Rasch analysis to investigate threshold order, differential item functioning (DIF), and item and overall fit to the model. The Skindex-29 did not fit the Rasch model (P0.05). Classical psychometric properties such as response distribution, item-rest correlation, item complexity, and internal consistency of the two subscales of Skindex-17 were at least adequate. The Skindex-17 is a Rasch reduced version of Skindex-29, with two independent scores that can be used in the measurement of HRQOL in dermatological patients.

Original languageEnglish
Pages (from-to)1244-1250
Number of pages7
JournalJournal of Investigative Dermatology
Issue number6
Publication statusPublished - Jun 2006

ASJC Scopus subject areas

  • Dermatology


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