Responsiveness and minimal important change of the Norwegian version of the Disabilities of the Arm, Shoulder and Hand questionnaire (DASH) in patients with subacromial pain syndrome

BACKGROUND: The Disabilities of the Arm, Shoulder, and Hand questionnaire (DASH) is a valid and reliable patient-reported outcome measure (PROM). It was designed to measure physical disability and symptoms in patients with musculoskeletal disorders of the upper extremity, and is one of the most commonly used PROMs for patients with shoulder pain. The aim of this study was to examine responsiveness, the smallest detectable change (SDC) and the minimal important change (MIC) of the DASH, in line with international (COSMIN) recommendations. METHODS: The study sample consisted of 50 patients with subacromial pain syndrome, undergoing physical therapy for 3–4 months. Responsiveness to change was examined by calculating area under the receiver operating characteristic curves (AUC) and testing a priori-formulated hypothesis regarding correlations with changes in other instruments that measuring the same construct. The SDC was calculated using a test re-test protocol, and the MIC was calculated by the anchor-based MIC distribution. MIC values for patients with low and high baseline scores were also calculated. RESULTS: DASH appeared to be responsive, as it was able to distinguish patients who reported to be improved from those unchanged (AUC 0.77). All of the hypotheses were accepted. The SDC was 11.8, and the MIC was 4.4. CONCLUSION: This study shows that the Norwegian version of the DASH has good responsiveness to change and may thus be recommended to measure outcome in patients with shoulder pain in Norway.