"In 2017, an estimated 20.7 million people aged 12 or older needed substance use treatment. This translates to about 1 in 13 people who needed treatment. Among young adults aged 18 to 25, however, about 1 in 7 people needed treatment. For NSDUH, people are defined as needing substance use treatment if they had an SUD in the past year or if they received substance use treatment at a specialty facility in the past year.⁴