| MEASUREMENT PROPERTIES | |
| Limitations | <5 European languages (English) |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Not Tested |
| Cronbach's (Describe) |
Cronbach's α = 0.63 |
| B. Reliability intraobserver or test-retest | Not Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
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| 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 | Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
The HUPI was developed by analyzing the balance between simplicity, reliability, accuracy, and sensitivity. In the resulting versions, the variables were weighted according to their quartile distribution in the study population. The best index, the HUPI10, used a common score for SJC and GDA‐P and a sex‐adjusted score for TJC and ESR. The HUPI has therefore face validity. |
| B. Construct Validity: Structural validity |
Not Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | Not Tested |
| Brief Description | |
| C. Criterion validity | Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
The AUC for the HUPI was very high (0.956), slightly larger than that of the DAS28‐ESR (0.930; P = 0.001) or the DAS28‐CRP (0.945; P = 0.077), and similar to that of the SDAI (0.957; P = 0.971) and the CDAI (0.964; P = 0.343). |