Table 4.

Intraclass correlation coefficients from test-retest study in a per protocol stable sample and a pseudo-stable sample with associated minimal detectable change thresholds.

Instrument and condition		na	Intraclass correlation coefficientagreement	95% CI	MDC95b points/eVASc units
eRMDQd
	Per protocol	15	0.87	0.66 to 0.95	4
	Allowing slight change	43	0.84	0.73 to 0.91	5
eVAS
	Per protocol	15	0.31	–0.25 to 0.71	39
	Allowing slight change	43	0.61	0.36 to 0.77	34
eNRSd
	Per protocol	22	0.52	0.14 to 0.77	4
	Allowing slight change	83	0.67	0.51 to 0.78	3

^aThe number of cases satisfying the condition for analysis as a stable case.

^bMDC₉₅: minimal detectable change at the 95% level.

^ceVAS: electronic visual analog scale.

^deRMDQ: electronic Roland Morris Disability Questionnaire.

^eeNRS: electronic numerical rating scale.