Table 3.

Comparative ROC curves for 3 parameters of disease activity

	Area under the curve	95% confidence interval	P-value	Optimal cut-off levels	Sensitivity (%)	Specificity (%)
White blood cell count	0.738	0.624–0.851	< 0.001	7250	72.4	68.7
Serum C-reactive protein	0.963	0.000–1.000	<  0.001	0.72	89.7	100
Serum 20S-proteasome	0.996	0.000–1.000	< 0.001	563.1	96.6	95.5