Noninvasive prediction of Ki-67 expression in pancreatic cancer via contrast-enhanced ultrasound quantitative parameters: A diagnostic model study

Table 4 Correlation of contrast-enhanced ultrasound parameters with different Ki-67 expression groups

	r value	P value
Rs50	0.538	< 0.001b
IMAX	0.612	< 0.001b
RT	-0.323	0.017b
WinAUC	0.173	0.211
FHT	-0.174	0.209
WoutAUC	0.354	0.009b
WioAUC	0.352	0.009b
WoutR	0.517	< 0.001b
FT	-0.156	0.260
Rs1090	0.618	< 0.001b
WinR	0.212	0.125
Fs50	-0.577	< 0.001b
AUC	0.373	0.006b
TTP	-0.280	0.040a
mTT	-0.087	0.532

^aP < 0.05.

^bP < 0.01.

Rs50: Rise slope 50%; IMAX: Maximum intensity; RT: Rise time; WinAUC: Wash-in area under the curve; FHT: Falling half time; WoutAUC: Wash-out area under the curve; WioAUC: Wash-in and out area under curve; FT: Falling time; Rs1090: Rise slope 10%-90%; WinR: Wash-in rate; Fs50: Falling slope 50%; AUC: Area under the curve; TTP: Time to peak; mTT: Mean transit time; WoutR: Wash-out rate.