Evaluation of Oxford instability shoulder score, Western Ontario shoulder instability Index and Euroqol in patients with slap (superior labral anterior posterior) lesions or recurrent anterior dislocations of the shoulder

Table 3 Agreement statistics, internal consistency and content validity for the domains of the WOSI 1. and 2.test

Outcome (scores)	Median (min., max.)	Limits of agreement (LoA)	ICC (2.1)^†(95% CI)	Floor effects %	Ceiling effects %	Minimal detectable change (MDC) (95% CI)	Standard error of measurement (SEM_agreement)	Chronbach’s alpha
Physical symptoms	452	(−171.4 to 54.3)	0.92 (0.88 to 0.95)	0	0	162.9 (108.9 to 216.9)	58.8	0.96
Physical symptoms	(20, 897)	(−171.4 to 54.3)	0.92 (0.88 to 0.95)			162.9 (108.9 to 216.9)
Sports, recreation and work	243 (21, 398)	(−96.6 to 118.5)	0.82 (0.72 to 0.88)	0	0	107.6 (72.0 to 143.2)	38.8	0.90
Lifestyle	190 (4, 399)	(−103.5 to 106.5)	0.87 (0.81 to 0.92)	0	0	105.0 (70.2 to 139.8)	37.8	0.93
Emotions	206 (2, 299)	(−91.2 to 116.2)	0.77 (0.65 to 0.85)	0	0	103.7 (69.3 to 138.1)	37.4	0.87

ICC (2.1), interclass correlation version 2.1 for measuring correlation between test and retest. Agreement estimated by the difference between test and retest, minimal detectable change (MDC) with 95% confidence interval, standard error of measurement (SEM_agreement), and limits of agreement (LoA). Chronbachs alpha (internal consistency) are given for the 2.test. Content validity is measured by floor and ceiling effects.
95% CI (confidence interval) for paired t-test under null hypothesis = no difference between test and retest score.
^†P< .0001 for all ICC (interclass correlation coefficient version 2.1).