| MEASUREMENT PROPERTIES | |
| Limitations | |
| Observations | |
| 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) |
Isenberg et al conducted two real‐patient exercises with eight adult patients with SLE and eight rheumatologists during the development of the BILAG 2004 index and demonstrated good reliability (intraclass correlation coefficient [ICC] >0.60) and high levels of physician‐patient agreement (ratio of SD attributable to the physicians/the SD attributable to the patient: <0.40) across all organ systems except for the musculoskeletal system. Interrater reliability was also assessed in a multicenter study by Yee et al using 97 patients with 2 exercises (E1 and E2). Several issues were identified in the glossary following E1, which was then updated and additional training provided to the raters. The overall ICC determined in E1 was 0.45 (95% confidence interval [CI] 0.31‐0.58) and improved to 0.67 (95% CI 0.54‐0.76) in E2 |
| C. Reliability interobserver or Measurement error | Not Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
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| 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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