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Table 1 iBE accuracy measures by definitive quadrants

From: A cost-effective handheld breast scanner for use in low-resource environments: a validation study

Total definitive quadrants N = 342 Mass positive Mass negative Measures
Test positive quadrant 66 28 PPV = 70.2 %
Test negative quadrant 11 237 NPV = 95.6 %
Measures Sn = 85.7 % Sp = 89.4 % Accuracy = 88.6 %