Detecting Triple-Vessel Disease with Cadmium Zinc Telluride-Based Single-Photon Emission Computed Tomography Using the Intensity Signal-to-Noise Ratio between Rest and Stress Studies

Table 2

Statistics and the ROC results of the QPS scores.

Parameter	SRS			SSS			SDS
	All	Control	TVD	All	Control	TVD	All	Control	TVD
Mean	2.12	2.07	2.2	5.44	3.52	8.29	3.28	1.46	6.00
SD	2.67	2.6	2.81	5.24	3.78	5.83	4.62	2.38	5.72
Sensitivity		34			78			68
Specificity		75			64			72
Accuracy		59			70			71
AUC		0.49			0.77			0.75
Cutoff		2.5			3.5			2.5
value	0.81

value is derived from the -test of the control versus TVD subjects. ROC, receiver-operating characteristic; QPS, quantitative perfusion single-photon emission computed tomography; SRS, summed rest scores; SSS, summed stress scores; SDS, summed difference scores; AUC, area under the curve.