Figure 2. Commonly studied medication errors as causes of adverse drug events (ADEs): percent of ADEs for each cause Reducing and Preventing Adverse Drug Events To Decrease Hospital Costs [D] Select for Text Description.Return to Document Current as of March 2001 Internet Citation: Figure 2. Commonly studied medication errors as causes of adverse drug events (ADEs): percent of ADEs for each cause: Reducing and Preventing Adverse Drug Events To Decrease Hospital Costs. March 2001. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/factsheets/errors-safety/aderia/figure2.html