A modified QuickDASH-9 provides a valid outcome instrument for upper limb function

Table 4 Methodological characteristics of QuickDASH-9, QuickDASH, DASH and ULFI

	Reliability	Internal consistency	Error score		Responsiveness			Missing responses
Stage	Rxx (ICC)	Alpha	SEM	MDC₉₀	SD₁₀₀	ES	SRM	Percentage
Calibration	(n = 46)	(n = 139)	(n = 29)	(n = 29)	(n = 29)	(n = 29)	(n = 29)	(n = 137)
QuickDASH-9	0.94	0.89	4.82	11.22%	20.05%	1.19	1.65	11%
QuickDASH	0.94	0.92	4.98	11.58%	20.71%	1.21	1.75	12.5%
DASH	0.98	0.96	2.84%	6.63%	19.67%	1.41	2.18	34%%
ULFI	0.96	0.89	4.50%	10.50%	21.61%	1.28	1.87	<0.5%
Validation	(n = 22)	(n = 67)	(n = 64)	(n = 64)	(n = 64)	(n = 64)	(n = 64)	(n = 67)
QuickDASH-9	0.94	0.925	7.38%	17.18%	26.07%	1.05	1.21	3.5%
QuickDASH	0.91	0.92	6.73%	15.66%	23.20%	1.05	1.23	26.5%
ULFI	0.98	0.92	3.41%	7.93%	24.16%	0.93	1.25	<0.5%

The QuickDASH psychometric properties are invalid. They are provided as a comparison to the other PROs and to the findings of previous QuickDASH studies.
SD100: Standard deviation at baseline (100% scale); Rxx: Test-retest reliability coefficient; ICC: Intra-class Correlation Coefficient for test-retest reliability; SEM: Standard Error of the Measurement; MDC90: Minimal Detectable Change (90% CI); ES: Effect Size; SRM: Standard Response Mean; Alpha: Cronbach's Alpha.

ISSN: 1471-2474