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Table 7 Measurement properties of the WOSI as presented in the original article and subsequent validation studies

From: Measurement properties of the Western Ontario Shoulder Instability Index in Dutch patients with shoulder instability

Study N Internal consistency ICC (interval) Construct validity   SEM and SDC Floor/ ceiling MIC SRM & ES
Kirkley et al. [7] Total: 300 N = 33 N = 51 N = 47 (baseline)   NA NA NA SRM 0.931
Not specified item reduction 0,494 (2wks) DASH 0.768
0.911 (3mnts) UCLA 0.649
Constant 0.590
Rowe 0.609
ASES 0.553
SF12 physical 0.656
SF-12 mental 0.115
ROM 0.394
Salomonsson et al. [11] Total: 99 N = 22 N = 32 N = 22   NA Not found NA N = 22
22 surgery α = 0.89 0.94 (2 mnts) VAS function 0.80     SRM 1.40
32 partly surgery EQ-5D 0.44 ES 1.67
45 healthy N = 32 Rowe 0.59
Hatta et al. [13] Total: 85 N = 85 N = 59 N = 85   NA NA NA NA
Not specified α = 0.84 0.91 (2wks) Quick DASH 0.63
    Rowe 0.42
SF-36  
Physical funct 0.36
Social funct 0.10
General health 0.27
Mental health 0.26
Vitality 0.28
Role emotional 0.16
Role functional 0.26
Bodily pain 0.34
Hofstaetter et al. [12] Total: 86 N = 24 N = 25 Rowe 0.627 NA High ceiling in healthy shoulders NA NA
24 surgery α = 0.92 0.92 (24–72 hr) UCLA 0.609
25 partly surgery    Constanst 0.590
37 healthy SF-36  
Physical funct 0.44
Social funct 0.32
General health 0.34
Mental health 0.38
Vitality 0.33
Role emotional 0.32
Role functional 0.39
Bodily pain 0.56
Drerup et al. [14] Total: 30 N = 29 N = 29 ASES 0,58 NA Not found NA NA
Not specified α = 0.89 0.87
Cacchio et al. [15] Total: 64 N = 64 N = 64 DASH 0.79 SEM 71 Not found 40 N = 39
Not specified α = 0.93 0.95 (3 days) SF-36 0.11 SDC 196 0 SRM 1.94
N = 20       ES 1.47
0.92 (14 wks)
  1. Measurement properties include the internal consistency (Cronbach’s α), intraclass correlation coefficient (ICC), construct validity (Pearson’s correlation coefficient), standard error of measurement (SEM), smallest detectable change (SDC), floor- and ceiling effects, minimum important change (MIC), and sensitivity to change [standardised response mean (SRM) and effect size (ES)]. NA means not assessed.