| MEASUREMENT PROPERTIES | |
| Limitations | >=5 European languages (English) |
| Observations |
The WORC Index is a rotator cuff–specific measurement instrument that has been evaluated among participants with various rotator cuff disorders as well as shoulder instability. It has also been shown to have moderate validity among patients with winged scapula |
| 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) |
There is evidence for high test-retest validity at 2-week intervals, with ICCs ranging from 0.54 (work) to 0.91 (physical symptoms) for the domains and 0.96 for the total score |
| 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 | 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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