Table 11. Concordance correlation coefficient between converted numeric rating scale change and residual symptom percentage.

	Concordance correlation coefficient	Precision	Accuracy
Neck pain
	0.43	0.51	0.85
Initial NRS> 7	0.60	0.72	0.82
Initial NRS≤ 7	0.42	0.51	0.82
Lower back pain
	0.16	0.20	0.77
Initial NRS> 7	0.51	0.59	0.85
Initial NRS≤ 7	0.07	0.12	0.55
All subject
	0.26	0.32	0.81
Initial NRS > 7	0.53	0.62	0.85
Initial NRS≤ 7	0.21	0.32	0.66

NRS, numeric rating scale.