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Table 5 Construct validity comparison between baseline and repeated measures

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

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
  1. * 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].
  2. ** p value <0.001 for all t-statistic measures.