Table 2. Diagnostic index of malignant ultrasound features.

Feature	Sensitivity	Specificity	Accuracy	PPV	NPV
Micro-lobulated shape	61.7%±10.8%	82.3%±7.8%	72.9%±6.6%	74.6%±10.7%	71.8%±8.5%
Micro-calcifications	81.5%±8.7%	72.9%±9.0%	76.8%±6.2%	71.7%±9.3%	82.4%±8.3%
Petaloid shape	69.1%±10.2%	95.8%±4.0%	83.6%±5.5%	93.3%±6.5%	78.6%±7.5%
ES 4–5	63.0%±10.8%	77.1%±8.6%	70.6%±6.8%	70.0%±10.8%	71.2%±8.9%
SR >2.82	67.9%±10.4%	79.2%±8.3%	74.0%±6.5%	73.3%±10.2%	74.5%±8.6%

PPV, positive predictive value; NPV, negative predictive value; ES, elastography score; SR, strain ratio.