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Table 4 Diagnostic performance of elasticity score and strain ratio in isolation and combined

From: B-mode ultrasound, color Doppler, and sonoelastography in differentiation between benign and malignant cervical lymph nodes with special emphasis on sonoelastography

  Elasticity score (ES) Strain ratio (SR) Combined ES and SR
Cut-off point > 47% > 1.9  
AUC 0.912 0.956 0.891
95% CI 0.78–0.98 0.84–0.996 0.75–0.97
P value < 0.001* < 0.001* < 0.001*
TP 55 55 58
TN 24 23 25
FP 3 3 1
FN 2 3 1
Sensitivity 96.4% 94.8% 98.3%
Specificity 88.8% 88.5% 96.1%
PPV 95.8% 94.8% 92.9%
NPV 92.3% 88.5% 96.1%
Accuracy 94.4% 92.8% 98.11%
  1. AUC area under curve, CI confidence interval, PPV positive predictive value, NPV negative predictive value