The percentage of patients undergoing surgical or ablation treatment (radiofrequency, laser, mechanochemical, chemical, or embolic adhesive) of truncal, perforator or cluster veins who have venous clinical severity score (VCSS) of the treated leg(s) assessed prior to treatment. Rationale: Pre-treatment assessment using VCSS, which measures 10 clinical signs and symptoms is recommended in practice guidelines to ensure that treatment is not being recommended for patients with minimal venous disease and to allow post-treatment assessment of improvement.