Validation of simplified scoring systems for assessing cutaneous disease activity in dermatomyositis
Authors' conclusion
Simplified CDASI scorings demonstrated preliminary evidence of favourable validity, reliability, and responsiveness in the longitudinal evaluation of rashes in DM patients.
Study context
- Population
- Adult dermatomyositis (DM) patients (81.5% female, 96.3% White, median age 50.0)
- Participants
- 27 patients
- Comparison
- Four simplified CDASI activity scores vs full CDASI activity score
- Outcome
- Convergent validity of all sCDASI scores
Methodological detailstwo clinic visits ≥2 months apart, two independent rheumatologist assessors
- Two clinic visits ≥2 months apart
- Two independent rheumatologist assessors
Performance
As reported in the abstract
CDASI
4.5
median · IQR 1.0–12.0
- Correlation of all sCDASI with full CDASI (Spearman ρ)
- 0.97-0.98
- Correlation of all sCDASI with MDAAT cutaneous VAS (Spearman ρ)
- 0.94
- Correlation of all sCDASI with Skindex (Spearman ρ)
- 0.82-0.83
Further findings
Inter-rater reliability
- High for all simplifications (strong correlations between assessors)
Responsiveness (change from baseline)
- Changes in sCDASI correlated strongly with changes in full CDASI and MDAAT cutaneous VAS
Original publication
Validation of simplified scoring systems for assessing cutaneous disease activity in dermatomyositis. Clin Exp Rheumatol. Published 18 June 2025. doi:10.
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