Table 3.

ROC analysis for identifying AD patients with depression from AD patients without depression using age and regional CBF.

Variables	Specificity (%)	Sensitivity (%)	Accuracy (%)	AUC
Age	75.00	77.78	76.19	0.77
CBF in the right supplementary motor area	58.33	88.89	71.43	0.79
CBF in the right supramarginal gyrus	91.67	55.56	76.19	0.76
Combination of age and regional CBF	100.00	66.67	85.71	0.87

ROC, receiver operating characteristic curve; AUC, area under the curve of receiver operating characteristic; AD, Alzheimer's disease; CBF, cerebral blood flow.