| MEASUREMENT PROPERTIES | |
| Limitations | English only |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Not Tested |
| Cronbach's (Describe) | |
| B. Reliability intraobserver or test-retest | Not Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
For juvenile IIM patients evaluated by trained assessors who evaluated the same patients in the morning and again in the afternoon, the Pearson’s correlation coefficient for the total scores for each assessor pair ranged from 0.97– 0.99 (all P < 0.001) and was 0.98 for the overall correlation of all assessors. |
| C. Reliability interobserver or Measurement error | Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
In juvenile IIM patients evaluated by 2 assessors, the intraclass correlation coefficient of the total score was 0.89 (very good) (30). In patients with juvenile IIM evaluated by 12 assessors, Kendall’s W for each item ranged from 0.77–1.0 (all P <0.001) and was 0.95 for the total score. |
| 2. VALIDITY | |
| A. Content validity: face validity | Not Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
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| 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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