Table 4.

Comparison of peak and average velocity of femoral vein between two groups.

Group	n	Preoperative		Postoperative day 1		Postoperative day 7
		Peak systolic velocity	Mean flow rate	Peak systolic velocity	Mean flow rate	Peak systolic velocity	Mean flow rate
Control group	45	17.01 ± 2.78	12.01 ± 3.03	16.32 ± 3.15	11.86 ± 3.71	20.01 ± 3.57	13.91 ± 3.26
Intervention group	45	16.78 ± 3.47	11.68 ± 3.01	17.89 ± 4.01	12.01 ± 4.15	25.10 ± 4.79	15.75 ± 3.02
t		0.347	0.518	-2.065	-0.181	-5.716	-2.778
P		0.729	0.606	0.042	0.857	0.000	0.007