Guideline No.	GRADE of recommendation	Level of evidence
6.1	1	A
We recommend that the CEAP classification be used for patients with varicose veins. The basic CEAP classification is used for clinical practice, and the full CEAP classification system is used for clinical research.
Guideline No.	GRADE of recommendation	Level of evidence
6.2	1	B
We recommend that primary venous disorders, including simple varicose veins, be differentiated from secondary venous insufficiency and from congenital venous disorders because the three conditions differ in pathophysiology and management.