Table 3.

Comparison of the diagnostic performance of the three imaging modalities, superb microvascular imaging (SMI), grayscale ultrasound (US), and color Doppler flow imaging (CDFI) of thyroid nodules.

	Sensitivity	Specificity	Accuracy	AUC	95% CI	P-value
US	72.41%	82.98%	78.95%	0.847	0.762~0.932	<0.001
US+CDFI	75.86%	87.23%	82.89%	0.911	0.849~0.973	<0.001
US+SMI	86.21%	85.11%	85.53%	0.918	0.856~0.979	<0.001

US – ultrasound; CDFI – color Doppler flow imaging; SMI – superb microvascular imaging; AUC – area under the curve; CI – confidence interval.