TABLE 2.

ROC curve analysis of AD and control subjects.

	Cutoff	Sensitivity	Specificity	AUC
Aβ42	17.22	0.650	0.719	0.689
t-tau	21.30	0.625	0.667	0.659
Aβ42 × t-tau	403.72	0.825	0.842	0.883
Aβ42/t-tau	0.74	0.775	0.386	0.558

AD, Alzheimer disease; NC, normal control; AUC, area under the receiver operating characteristic curve.