Comparison of the reliability and validity of outcome instruments for cutaneous dermatomyositis

R. Q. Klein, C. A. Bangert, M. Costner, M. K. Connolly, Akiko Tanikawa, J. Okawa, M. Rose, S. S. Fakharzadeh, D. Fiorentino, L. A. Lee, R. D. Sontheimer, L. Taylor, A. B. Troxel, V. P. Werth

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Background: Reliable and validated measures of skin disease severity are needed for cutaneous dermatomyositis (DM). Cutaneous Dermatomyositis Disease Area and Severity Index (CDASI), Dermatomyositis Skin Severity Index (DSSI) and Cutaneous Assessment Tool (CAT) skin indices have been developed as outcome instruments. Objectives: We sought to demonstrate reliability and validity of the CDASI, and to compare the CDASI with other potential tools for use in measuring disease severity in cutaneous dermatomyositis. Patients and methods: CDASI has four activity and two damage measures, with scores from 0 to 148. DSSI assesses activity based on body surface area and severity on a scale of 0-72. CAT uses 21 activity and damage items, for a range of 0-175 for activity and 0-33 for damage. Ten dermatologists used the instruments to score the same 12-16 patients in one session. Global validation measures were administered to physicians and patients. Results: Global validation measures correlated with the three outcome instruments (P < 0.0001). CAT displayed lower inter- and intrarater reliability relative to the CDASI. All scales correlate better with physician than patient global skin measures. Conclusions: It appears that the CDASI may be a useful outcome measure for studies of cutaneous DM. Further testing to compare responsiveness of all three measures is necessary.

Original languageEnglish
Pages (from-to)887-894
Number of pages8
JournalBritish Journal of Dermatology
Volume159
Issue number4
DOIs
Publication statusPublished - 2008 Oct

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Dermatomyositis
Reproducibility of Results
Skin Diseases
Skin
Outcome Assessment (Health Care)
Physicians
Body Surface Area

Keywords

  • CAT
  • CDASI
  • Dermatomyositis
  • DSSI
  • Outcome instrument
  • Severity index

ASJC Scopus subject areas

  • Dermatology

Cite this

Comparison of the reliability and validity of outcome instruments for cutaneous dermatomyositis. / Klein, R. Q.; Bangert, C. A.; Costner, M.; Connolly, M. K.; Tanikawa, Akiko; Okawa, J.; Rose, M.; Fakharzadeh, S. S.; Fiorentino, D.; Lee, L. A.; Sontheimer, R. D.; Taylor, L.; Troxel, A. B.; Werth, V. P.

In: British Journal of Dermatology, Vol. 159, No. 4, 10.2008, p. 887-894.

Research output: Contribution to journalArticle

Klein, RQ, Bangert, CA, Costner, M, Connolly, MK, Tanikawa, A, Okawa, J, Rose, M, Fakharzadeh, SS, Fiorentino, D, Lee, LA, Sontheimer, RD, Taylor, L, Troxel, AB & Werth, VP 2008, 'Comparison of the reliability and validity of outcome instruments for cutaneous dermatomyositis', British Journal of Dermatology, vol. 159, no. 4, pp. 887-894. https://doi.org/10.1111/j.1365-2133.2008.08711.x
Klein, R. Q. ; Bangert, C. A. ; Costner, M. ; Connolly, M. K. ; Tanikawa, Akiko ; Okawa, J. ; Rose, M. ; Fakharzadeh, S. S. ; Fiorentino, D. ; Lee, L. A. ; Sontheimer, R. D. ; Taylor, L. ; Troxel, A. B. ; Werth, V. P. / Comparison of the reliability and validity of outcome instruments for cutaneous dermatomyositis. In: British Journal of Dermatology. 2008 ; Vol. 159, No. 4. pp. 887-894.
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