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About 26% of people in the US have an anxiety, mood, impulse control, or substance disorder

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Q What is the 12 month prevalence, severity, and comorbidity of DSM-IV mental disorders as found in the US National Comorbidity Survey Replication?


Embedded ImageDesign:

Cross sectional study.

Embedded ImageSetting:

Mainland USA (not Alaska); February 2001 to April 2003.

Embedded ImagePopulation:

9282 English speaking adults (⩾18 years old), selected from a multistage clustered area probability sample of households.

Embedded ImageAssessment:

Participants were assessed in face to face interviews for core DSM-IV diagnoses using the World Health Organisation World Mental Health Survey Initiative version of the Composite International Diagnostic Interview (CIDI). Cases were classified as serious (presence of ⩾1 of the following: positive non-affective psychosis screen; bipolar disorder; impulse control disorder with serious repeated violence; serious role impairment resulting from substance abuse disorder; severe work limitation or disability; suicide attempt or 30 or more …

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  • For correspondence: Ronald C Kessler, PhD, Department of Health Care Policy, Harvard Medical School, 180 Longwood Ave, Boston, MA 02115, USA; ncs{at}

  • Sources of funding: National Institute of Mental Health, National Institute of Drug Abuse, the Substance Abuse and Mental Health Services Administration, The Robert Wood Johnson Foundation, and the John W Alden Trust.

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