Table 1. The clinical information of 32 patients involved in the study.

		Male	Female	Total
Patients number of gender		14	18	32
Age±SD(years)		54.4±13.2	54.9±8.9	54.7±10.8
Course of CVI(years)		11.1±9.4	12.3±8.6	11.6±8.9
Previous chronic illnesses	Hypertension	5	3	8
	Parkinson	1	0	1
	Diabetes	1	0	1
Limbs of Surgery	left limb	5	5	10
	right limb	7	8	15
	double limbs	2	5	7
CEAP grade	Class 6	1	0	1
	Class 5	1	0	1
	Class 4	12	18	30
Specialist physic examination	Perthes test (−)	14	18	32
Duplex ultrasound scanning	Deep venous thrombosis	0	2	2
	Valve insufficiency of GSV	14	18	32
	Reflux of GSV	14	18	32