The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A researcher is interested in identifying the most effective treatment for uncomplicated urinary tract infections (UTI) in women between the ages of 18 and 50. Of 200 consecutive women who present to the emergency room for such a UTI, 50 are randomized to each of the following: nitrofurantoin 100 mg every 12 hours for 5 days, nitrofurantoin 100 mg every 12 hours for 7 days, cefpodoxime 100 mg every 12 hours for 5 days, and cefpodoxime 100 mg every 12 hours for 7 days. The measured outcomes include progression to pyelonephritis, positive urine culture on day 7 after initiation of treatment, and likelihood of re-presenting to the emergency room for another UTI within 90 days. Which of the following best describes this type of study?   (A) Parallel study   (B) Factorial design study   (C) Between patient study   (D) Cluster randomized trial
['(B) Factorial design study <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Parallel study \n (B) Factorial design study \n (C) Between patient study \n (D) Cluster randomized trial <> possible answers', '  A researcher is interested in identifying the most effective treatment for uncomplicated urinary tract infections (UTI) in women between the ages of 18 and 50. Of 200 consecutive women who present to the emergency room for such a UTI, 50 are randomized to each of the following: nitrofurantoin 100 mg every 12 hours for 5 days, nitrofurantoin 100 mg every 12 hours for 7 days, cefpodoxime 100 mg every 12 hours for 5 days, and cefpodoxime 100 mg every 12 hours for 7 days. The measured outcomes include progression to pyelonephritis, positive urine culture on day 7 after initiation of treatment, and likelihood of re-presenting to the emergency room for another UTI within 90 days. Which of the following best describes this type of study? <> context@']