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

Table 5 Construct validity comparison between baseline and repeated measures

Stage	Baseline Mean	Repeat Test * Mean	Paired t- Stat **
Calibration Sample n = 31
QuickDASH-9	54.9 ± 20.5	46.9 ± 26.6	5.2
QuickDASH	58.1 ± 20.8	40.6 ± 23.1	5.7
DASH	51.6 ± 20.5	34.7 ± 22.2	6.4
ULFI	58.1 ± 23.0	41.3 ± 26.6	5.6
Validation Sample n = 64
QuickDASH-9	47.0 ± 26.1	23.2 ± 18.6	4.1
QuickDASH	44.4 ± 23.2	20.0 ± 16.1	4.2
ULFI	41.5 ± 24.6	19.8 ± 19.1	7.6

* Repeated measures made following a period of anticipated change due to natural healing and therapist intervention: at two weeks for acute participants, four weeks for subacute and six weeks for chronic [9, 11, 39].
** p value <0.001 for all t-statistic measures.

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