^a Major depressive episode (MDE) is defined as a period of at least 2 weeks when a person experienced a depressed mood or loss of interest or pleasure in daily activities and had a majority of the symptoms of depression as described in the 4th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV). Treatment is defined as seeing or talking to a medical doctor or other professional or using prescription medication for depression in the past year. Respondents with unknown data for past year MDE measures or unknown treatment data were excluded.

^b Estimates for 2004 are based on a subsample of respondents age 18 or older, while 2007 estimates are based on all respondents age 18 and over.

^c Estimates are based on a revised definition of poverty level that incorporates information on family income, size, and composition and is calculated as a percentage of the U.S. Census Bureau's poverty thresholds. Negative/poor refers to household incomes below the Federal poverty line; near poor/low, the poverty line to just below 200 percent of the poverty line; middle, 200 percent to just below 400 percent of the poverty line; and high, 400 percent of the poverty line and over. Respondents with unknown poverty information were excluded.

DNA - Data have not been analyzed.

DSU - Data do not meet the criteria for statistical reliability, data quality, or confidentiality.

Key: AI/AN: American Indian or Alaska Native; NHOPI: Native Hawaiian or Other Pacific Islander; MSA: metropolitan statistical area; SE: standard error.

Source: Substance Abuse and Mental Health Services Administration, Office of Applied Studies, National Survey on Drug Use and Health.