Table 2.

Receiver operating characteristic (ROC) analysis of early enhancement parameters in diagnosing early-phase spinal tuberculosis

Variables		AUC	95%CI	Sensitivity (%)	Specificity (%)	Cut-off value	Y-index	P
Efirst	4 weeks	0.82	(0.68, 0.97)	72.00	80.00	≥ 0.73	0.52	0.003
	6 weeks	0.76	(0.58, 0.93)	48.00	100.00	≥ 1.54	0.48	0.019
	8 weeks	0.76	(0.60, 0.92)	48.00	100.00	≥ 2.02	0.48	0.019
Vfirst	4 weeks	0.56	(0.31, 0.81)	84.00	50.00	≥ 0.64	0.34	0.596
	6 weeks	0.61	(0.38, 0.83)	76.00	60.00	≥ 1.15	0.36	0.333
	8 weeks	0.62	(0.39, 0.86)	84.00	50.00	≥ 1.38	0.34	0.258
Ee	4 weeks	0.75	(0.59, 0.91)	56.00	90.00	≥ 0.77	0.46	0.022
	6 weeks	0.77	(0.58, 0.96)	80.00	70.00	≥ 0.88	0.50	0.013
	8 weeks	0.77	(0.61, 0.93)	72.00	80.00	≥ 1.15	0.52	0.014
Ve	4 weeks	0.53	(0.30, 0.76)	36.00	80.00	≥ 1.05	0.16	0.784
	6 weeks	0.59	(0.36, 0.82)	84.00	50.00	≥ 1.01	0.34	0.411
	8 weeks	0.59	(0.34, 0.84)	80.00	60.00	≥ 1.20	0.40	0.411

AUC area under ROC curve, 95%CI 95% Confidence interval, Efirst First-pass enhancement rate, Vfirst First-pass enhancement velocity, Ee Early enhancement rate, Ve Early enhancement velocity