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Table 4 Reliability

From: The shortened disabilities of the arm, shoulder and hand questionnaire (Quick DASH): validity and reliability based on responses within the full-length DASH

Scale Test-retest reliability Cross-sectional reliability Agreement with DASH   
  Baseline   Baseline   Follow-up   Baseline   Follow-up  
  Agreement Difference*      Agreement Difference Agreement Difference
  ICC (95% CI) mean (95% CI) alpha ITC range alpha ITC range ICC (95% CI) mean (95% CI) ICC (95% CI) mean (95% CI)
DASH 0.93 (0.86–0.97) 0.9 (- 2.3–4.0)a 0.97 0.41–0.86 0.98 0.57–0.90 1 0 1 0
Quick DASH 0.93 (0.87–0.97) -0.2(-3.6–3.1)b 0.92 0.42–0.83 0.95 0.63–0.88 0.96 (0.84–0.98) 4.2 (3.2–5.3) 0.97 (0.92–0.99) 2.6 (1.7–3.4)
Random-11 1 0.92 (0.84–0.96) -2.1(-5.7–1.5)c 0.93 0.55–0.82 0.95 0.55–0.88 0.96 (0.92–0.98) 3.1 (2.0–4.2) 0.97 (0.91–0.98) 3.4 (2.4–4.5)
Random-11 2 0.93 (0.85–0.96) -0.3(-3.7–3.1)b 0.91 0.42–0.81 0.95 0.62–0.87 0.97 (0.96–0.98) 1.7 (0.7–2.7) 0.99 (0.98–0.99) 0.7 (0–1.4)
  1. *calculated as the score at time 1 minus the score at time 2.
  2. All ICC values were statistically significant (p < 0.001).
  3. All differences between the DASH and the other 3 forms were significant (p ≤ 0.001) except for random-11 form 2 at follow-up (p = 0.053)
  4. ap = 0.6, bp = 0.9, cp = 0.2.
  5. ICC, intraclass correlation coefficient; alpha, Cronbach alpha coefficient; ITC, item-total correlation