| 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) |
The SvdH method for PsA has shown good intrarater reliability (ICC >0.97) in several studies of biologic agents. |
| C. Reliability interobserver or Measurement error | Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
Baseline interrater reliability was high at 0.95 (95% confidence interval: 0.83-0.99). Interrrater reliability at follow-up ranged was 0.92 for erosions and 0.96 for joint space narrowing. |
| 2. VALIDITY | |
| A. Content validity: face validity | Not Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
Not applicable. |
| B. Construct Validity: Structural validity |
Not Tested |
| Hypotheses-testing | Not Tested |
| Cross-cultural validity | 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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