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Table 5 Diagnostic accuracy of SMG in tested patients with ACR grade A/B versus the result of biopsy or follow-up as the gold standard for lesion classification

From: Contrast-enhanced spectral mammography: successful initial clinical institute experience

Lesion classification by SMG Final diagnosis  
Malignant Benign Total
Probably malignant (BIRADS 4–6) 33 7 40
Probably benign (BIRADS 1–3) 3 6 9
Total 36 13 49
Statistic Value Lower bound (95%) Upper bound (95%)
Correct classification 80% 68% 91%
Misclassification 20% 9% 32%
Sensitivity 92% 77% 98%
Specificity 46% 23% 71%
False positive rate 54% 30% 78%
False negative rate 8% 0% 17%
Prevalence 73% 61% 86%
Positive predictive value (PPV) 83% 71% 94%
Negative predictive value (NPV) 67% 36% 97%
Positive likelihood ratio (LR+) 1.70 1.02 2.84
Negative likelihood ratio (LR−) 0.18 0.05 0.62
Relative risk 2.48 1.06 5.76
Odds ratio 9.43 2.06 43.18
  1. Data in cross-tables are counts