Table 4.

Correlations between the VI and quantified contrast-enhanced ultrasonography parameters considering in the different groups.

Correlation of VI with	Correlation coefficient (r)	P value	Fisher’s z	95% confidence interval
Peak intensity (PI)	0.854	< 0.001	1.271	0.770 ~ 0.909
Rise time (RT)	-0.038	0.767	-0.038	-0.281 ~ 0.209
Mean transit time (MTT)	-0.326	0.009	-0.338	-0.529 ~ 0.087
Area under the curve (AUC)	0.625	< 0.001	0.733	0.448 ~ 0.755
Wash-in area under curve (iAUC)	0.584	< 0.001	0.669	0.395 ~ 0.726
Wash-out area under curve (oAUC)	0.595	< 0.001	0.685	0.409 ~ 0.734
Time to peak (TTP)	-0.284	0.023	-0.292	-0.495 ~ 0.041
Fall time (FT)	-0.044	0.731	-0.044	-0.287 ~ 0.204
Wash-in rate (WiR)	0.444	< 0.001	0.477	0.223 ~ 0.622
Wash-out rate (WoR)	-0.167	0.189	-0.169	-0.396 ~ 0.082
Mean intensity (Mean Int)	0.563	< 0.001	0.637	0.369 ~ 0.711
Standard deviation (STD)	0.543	< 0.001	0.608	0.342 ~ 0.696