| MEASUREMENT PROPERTIES | |
| Limitations | |
| Observations |
Items were selected by literature review and expert opinion (orthopedic surgeons who specialized in sports medicine, physical therapists, and athletic trainers) and by surveying patients with knee disorders. Item reduction involved 50 patients with a variety of knee disorders who were physically active who rated the importance and difficulty associated with each functional task on the preliminary list. The top four, as agreed by the panel of clinicians, were retained in the final version |
| 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) |
One study has evaluated the test‐retest reliability of the ARS, finding adequate reliability for use in groups and individuals |
| 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 use of patients with knee disorders in both item selection and reduction ensures content validity. The final item selection also involved the opinion of clinicians to ensure face validity |
| 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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