Responsiveness, minimal importance difference and minimal detectable change scores of the shortened disability arm shoulder hand (QuickDASH) questionnaire
Polson, Kate; Reid, Duncan; McNair, Peter J.; Larmer, Peter
The aim of this study was to determine the responsiveness, Minimal Important Difference (MID) and Minimal Detectable Change (MDC) scores of the shortened Disability Arm Shoulder Hand (QuickDASH) questionnaire. Participants (n = 35) were recruited from private physiotherapy practices. Participants completed the QuickDASH questionnaire on two occasions; the first prior to treatment and the second at discharge or at six weeks post baseline, whichever event occurred first. The participants also completed a Global Change in Status Questionnaire (GSCQ). Responsiveness across treatment to discharge or at six weeks post initial visit was analysed by calculating the Effect Size (ES) and Standardised Response Mean (SRM). The MID was calculated using an anchor based approach and the MDC score was based upon calculations of the standard error of measurement (SEM). The results indicated that responsiveness was high (ES = 1.02, SRM = 1.1). The MID was 19 points while the MDC was 11 points. These results provide evidence that the QuickDASH is a responsive instrument when utilised in patients seen in private practice over a typical treatment interval. Copyright 2010 Elsevier Ltd. All rights reserved.