Table 7.

MCID values of ODI after SI joint fusion as calculated by four methods

	SF-36 health transition	Satisfaction
MDC (95 % CI)	15.5	13.5
Average change	19.5	12.2
Change difference	6.3	3.5
ROC curve (AUC)	15.0 (.629)	13.0 (.530)

MDC (95 % CI): minimum detectable change with 95 % confidence interval. Average change: average change among “somewhat better” for the health transition or “somewhat satisfied” for the satisfaction scale. Change difference: difference in the change of the “somewhat better” versus “about the same” for the SF-36 health transition and the “somewhat satisfied” and “somewhat dissatisfied” for the satisfaction scale

ROC Curve receiver operating characteristics curve. AUC area under the curve