Table 3.

Area under the receiver operating characteristic curve (AUC) with 95% confidence interval for sample I and II

	Sample I		Sample II
	AUC	95 % CI	AUC	95 % CI
ProFitMap-neck
Symptom-intensity index	0.77	0.67–0.87	0.84	0.76–0.92
Symptom-frequency index	0.80	0.71–0.89	0.80	0.71–0.89
Function index	0.74	0.63–0.85	0.76	0.67–0.86
Total score	0.78	0.68–0.88	0.83	0.75–0.92
NDI	0.75	0.65–0.85	0.86	0.79–0.93

AUC reflects the ability of the scale to discriminate between improved and not or little changed participants. AUC = 0.5 indicates discrimination by chance, and a value of 1 indicates perfect discrimination [38]

NDI Neck Disability Index