The information resulting from comparative effectiveness research provides evidence-based information to determine which treatment works best and for which patient in a real-world environment.

Comparative effectiveness utilizes a variety of data sources and methods to conduct time and relevant research and disseminate the results in a form that is usable by clinicians, patients, policymakers and health plans and payers.

Reference: 
Chiquette E, Posey L. eChapter 4. Evidence-Based Medicine. In: DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells BG, Posey L. eds. Pharmacotherapy: A Pathophysiologic Approach, 9e. New York, NY: McGraw-Hill; 2014.