 Rates of diagnosis and treatment have increased in both the United Kingdom and the United States since the 1970s . This is believed to be primarily due to changes in how the condition is diagnosed and how readily people are willing to treat it with medications rather than a true change in how common the condition is . It is believed that changes to the diagnostic criteria in 2013 with the release of the DSM @-@ 5 will increase the percentage of people diagnosed with ADHD , especially among adults . 
