N for the satisfaction question (“Are you satisfied with the effect of treatment on your erections?”) is equal to the number of men who answered. Some of the discontinued subjects supplied satisfaction data. A total of 1,545 men were originally enrolled in the double-blind trials, with 1,358 of these men continuing in the initial open-label extension studies. Number of patients and treatment duration in the original double-blind trials and the initial open-label extensions and disposition throughout 4 years of open-label, flexible-dose (25, 50, and 100 mg) <a href = 'https://www.ciaonlinebuy.us'>sildenafil</a> long-term extension study.