| MEASUREMENT PROPERTIES | |
| Limitations | >=5 European languages (English) |
| Observations |
Translated versions can be found on the official website: http://dash.iwh.on.ca/translations. Researchers and commercial organisations wishing to use the translated measure should contact the developers. |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
Cronbach’s alpha=0.92–0.98 (0.92 to 0.95 for the QuickDASH) |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
The DASH demonstrates high test-retest reliability, with reported ICCs ranging from 0.89 to 0.98 for the DASH and 0.90 to 0.94 for the Quick- DASH |
| C. Reliability interobserver or Measurement error | Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
SEM=2.8–5.2; Minimally detectable change 95% CI: 7.9–12.8 (average 10.8). |
| 2. VALIDITY | |
| A. Content validity: face validity | Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
Draft items were identified by literature review (821 items were reduced to 67 plus 3 new) because of content overlap or off-target questions determined by a group consensus). Patient data were analyzed by different item to total correlation techniques, comparison to clinimetric ranking and clinical judgment, resulting in the final 30-item version |
| B. Construct Validity: Structural validity |
Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | Tested |
| Brief Description |
Rasch analysis and factor analysis were used (Cano, 2011; Franchignoni, 2010) which highlighted areas for potential improvement for the use of the DASH. |
| C. Criterion validity | Not Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
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