Prevalence of Any Mental Illness Among Adults in the US

"Adults aged 18 or older were classified as having AMI [Any Mental Illness] if they had any mental, behavioral, or emotional disorder in the past year of sufficient duration to meet DSM-IV criteria (excluding developmental disorders and SUDs).46 Adults who were classified as having AMI were classified as having SMI [Serious Mental Illness] if they had any mental, behavioral, or emotional disorder that substantially interfered with or limited one or more major life activities. Statistical prediction models that were developed using clinical interview data from a subset of NSDUH adult respondents in 2008 to 2012 were used to classify whether respondents in the 2008 to 2019 adult samples had AMI or SMI in the past year.59

"Among adults aged 18 or older, the percentage with past year AMI increased from 17.7 percent (or 39.8 million people) in 2008 to 20.6 percent (or 51.5 million people) in 2019 (Figure 51 and 2019 DT 10.1). These estimates in 2019 were higher than the estimates in each year from 2008 through 2018.

"Aged 18 to 25
"Among young adults aged 18 to 25, the percentage with past year AMI increased from 18.5 percent (or 6.1 million people) in 2008 to 29.4 percent (or 9.9 million people) in 2019 (Figure 51 and 2019 DT 10.1). These estimates in 2019 were higher than the estimates in each year from 2008 through 2018.

"Aged 26 to 49
"Among adults aged 26 to 49, the percentage with past year AMI increased from 20.7 percent (or 20.7 million people) in 2008 to 25.0 percent (or 25.3 million people) in 2019 (Figure 51 and 2019 DT 10.1). These estimates in 2019 were higher than the estimates in each year from 2008 through 2018.

"Aged 50 or Older
"Among adults aged 50 or older in 2019, 14.1 percent (or 16.3 million people) had AMI in the past year (Figure 51 and 2019 DT 10.1). This percentage in 2019 was similar to the percentages in most years from 2008 through 2018."

Source: 

Substance Abuse and Mental Health Services Administration. (2020). Key substance use and mental health indicators in the United States: Results from the 2019 National Survey on Drug Use and Health (HHS Publication No. PEP20-07-01-001, NSDUH Series H-55). Rockville, MD: Center for Behavioral Health Statistics and Quality, Substance Abuse and Mental Health Services Administration.