| MEASUREMENT PROPERTIES | |
| Limitations | |
| Observations |
The mean activity score in the initial validation study ranged from 10.1 to 40, and the mean damage score ranged from 0.7 to 41.6 |
| 1. RELIABILITY | |
| A. Internal Consistency | Not Tested |
| Cronbach's (Describe) | |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
Spearman's coefficient for intrarater reliability was 0.96 for the activity score (95% CI 0.89‐1.00) and 0.99 for the damage score (95% CI 0.97‐1.00). |
| C. Reliability interobserver or Measurement error | Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
The ICC for interrater reliability was 0.86 for the activity score (95% CI 0.73‐0.99) and 0.92 for the damage score (95% CI 0.85‐1.00) |
| 2. VALIDITY | |
| A. Content validity: face validity | Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
Content and face validity have been assessed among dermatologists, rheumatologists, and an ACR response criteria committee on SLE using standardized interviews, with appropriate changes in the score made based on their suggestions (Albrecht J, et al. The CLASI (Cutaneous Lupus Erythematosus Disease Area and Severity Index): an outcome instrument for cutaneous lupus erythematosus. J Invest Dermatol 2005; 125: 889– 94.) |
| B. Construct Validity: Structural validity |
Not Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | Not Tested |
| Brief Description | |
| C. Criterion validity | Not Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
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