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From the source: "Data for 2017–2018 are based on a sample of 3,100 emergency department (ED) visits with opioids prescribed at discharge. This sample represents an estimated 12,519,000 average annual visits. Data for 2019–2020 are based on a sample of 2,015 ED visits with opioids prescribed at discharge. This sample represents an estimated 9,132,000 average annual visits. Visit rates are based on the July 1, 2017; July 1, 2018; July 1, 2019; and July 1, 2020, estimates of the U.S. civilian noninstitutionalized population developed by the U.S. Census Bureau, Population Division. Overall visits include all visits by adults aged 18 and over. “Prescribed at discharge” includes visits where opioids were both given in the ED and prescribed at discharge or only prescribed at discharge; visits where opioids were only given in the ED were excluded. In 2019–2020, opioids were prescribed at discharge at 17.1 visits per 1,000 adults, and opioids were both given in the ED and prescribed at discharge at 19.3 visits, totaling 36.4 visits. In 2017–2018, opioids were prescribed at discharge at 24.3 visits, and opioids were both given in the ED and prescribed at discharge at 26.2 visits, totaling 50.5 visits. Data for 0.3% of visits in 2017–2018 and 0.5% of visits in 2019–2020 with missing prescribed status are not shown."