Table 2. ROC area comparison of CEUS, BRAF V600E gene and their joint application.

Detection method	AUC	χ2 value	P value	95% CI floor	The upper limit of 95% CI
CEUS	0.884	114.054	0.000	0.839	0.929
BRAF V600E gene	0.827	121.987	0.000	0.776	0.878
CEUS + BRAF V600E gene	0.923	109.427	0.000	0.887	0.959

ROC, receiver operating characteristic; CEUS, contrast-enhanced ultrasound.