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

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

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				ES 1.67
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
Drerup et al. [14]	Not specified	α = 0.89	0.87	ASES	0,58	NA	Not found	NA	NA
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	Not found	0	SRM 1.94
			N = 20						ES 1.47
			0.92 (14 wks)						ES 1.47

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.

ISSN: 1471-2474