data item AE prevalence rate AG, YH A data item that is defined as the number of patients realized with an adverse event beginning in an interval or continuing from a previous interval divided by the number of patients taking the same medical intervention within that interval. The prevalence thus indicates the number of events that began and persisted over time. WEB: http://www.crilifetree.com/pdfs/drug-safety/long-term-safety-study-of-morphine-sulfate-and-naltrexone-hydrochloride.pdf