For a certain type of ulcer, traditional therapies can completely cure ulcers in 44% of patients within 6 months. A new treatment for this kind of ulcers has made 80% of ulcers achieved significant improvements in a 6-month trial and 61% were cured. Since the trial only treated those with more severe ulcers, this new treatment was obviously more effective than traditional therapies. What additional evidence is needed to better compare the effects of the two therapies? ['which is the difference between the two methods?', 'Are there significant differences in the cost of using the two therapies?', 'What percentage of patients with this ulcer treated with traditional therapies in 6 months have achieved significant improvement.', 'What percentage of patients who participated in a 6-month trial of a new therapy was dissatisfied with the rate of recovery.']