German version of the whiplash disability questionnaire: reproducibility and responsiveness

Table 2 Responsiveness statistics

Outcome	WDQ-G	SF-36BP	NASS-PF	VAS
Precision-referenced (non-dichotomised from ME1 to ME3)
SRM	1.19	1.00	0.75*	0.91*
Precision-referenced (stable ME1 to ME2)
ICC (95% CI lower-upper)	0.91 (0.80–0.95)	0.76 (0.61–0.85)	0.94 (0.89–0.97)	0.79 (0.61–0.89)
SEM	6.14	5.58	0.19	0.82
MDC	17	16	0.53	2.26
Criterion-referenced (improved from ME1 to ME3 vs. stable from ME1 to ME2)
ROC cut-off (MIC)	11 (17)^§	16 (16)^§	0.15 (0.6)^§	1.850 (2.3)^§
ROC AUC	0.85 (0.76–0.93)	0.880 (0.81–0.95)	0.78 (0.69–0.88)	0.87 (0.79–0.94)

*significant difference compared to WDQ-G SRM on the level of 0.01; ME Measurement Event; SD Standard Deviation; WDQ-G Whiplash Disability Questionnaire; SF-36BP 36 Item Short Form Health Survey Bodily Pain Subscale; NASS-PF North American Spine Society Questionnaire Pain and Function Subscale; SRM Standardised Response Mean; ICC Intraclass Correlation Coefficient; SEM Standard Error of Measurement; MDC Minimal Detectable Change; ROC Receiver Operating Characteristics; ^§ MIC Minimal Important Change (equals numbers in brackets); AUC Area under Curve of ROC.

ISSN: 1477-7525