TABLE 2.

The ROC curve of left hippocampal structural images, ALFF in slow-5 frequency band and their combined model.

Classifier	Model	Data set	AUC	95% CI	Accuracy
AD vs. NCs	T1	Training	0.864	0.841–0.887	0.778
		Test	0.818	0.767–0.858	0.790
	ALFF	Training	0.828	0.801–0.853	0.767
		Test	0.809	0.758–0.856	0.816
	T1+ALFF	Training	0.873	0.849–0.895	0.789
		Test	0.837	0.792–0.872	0.763
aMCI vs. NCs	T1	Training	0.729	0.689–0.766	0.682
		Test	0.713	0.650–0.772	0.786
	ALFF	Training	0.764	0.725–0.800	0.788
		Test	0.738	0.678–0.796	0.714
	T1+ALFF	Training	0.804	0.763–0.834	0.788
		Test	0.718	0.657–0.774	0.714

AD, Alzheimer’s disease; aMCI, amnestic mild cognitive impairment; NCs, normal controls; ROC, area under the curve; ALFF, the amplitude of low frequency fluctuation.