title: Age and birth cohort differences in the prevalence of common mental disorder in England: National Psychiatric Morbidity Surveys 1993-2007.
abstract: BACKGROUND
  There are concerns that the prevalence of mental disorder is increasing.
  
  
  OBJECTIVE
  To determine whether the prevalence of common adult mental disorders has increased over time, using age-period-cohort analysis.
  
  
  METHODS
  The study consisted of a pseudocohort analysis of a sequence of three cross-sectional surveys of the English household population. The main outcome was common mental disorder, indicated by a score of 12 or above on the Revised Clinical Interview Schedule (CIS-R). Secondary outcomes were neurotic symptoms likely to require treatment, indicated by a CIS-R score of 18 or over, and individual subscale scores for fatigue, sleep problems, irritability and worry.
  
  
  RESULTS
  There were 8670 participants in the 1993 survey, 6977 in the 2000 survey and 6815 in the 2007 survey. In men a significant increase in common mental disorder occurred between the cohort born in 1943-9 and that born in 1950-6 (odds ratio 1.4, 95% CI 1.1-1.9) but prevalence in subsequent cohorts remained largely stable. More extended increases in prevalence of sleep problems and mental disorders were observed in women, but not consistently across cohorts or measures.
  
  
  CONCLUSIONS
  We found little evidence that the prevalence of common mental disorder is increasing.
authors.affiliation: Department of Health Sciences, University of Leicester, Leicester, UK. nas6@le.ac.uk
authors.forename: Nicola
authors.initials: N
authors.lastname: Spiers
authors.forename: Paul
authors.initials: P
authors.lastname: Bebbington
authors.forename: Sally
authors.initials: S
authors.lastname: McManus
authors.forename: Traolach S
authors.initials: TS
authors.lastname: Brugha
authors.forename: Rachel
authors.initials: R
authors.lastname: Jenkins
authors.forename: Howard
authors.initials: H
authors.lastname: Meltzer
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D004739:England / Q000453:epidemiology; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000453:epidemiology*; D008875:Middle Aged; D009017:Morbidity / Q000639:trends; D009497:Neurotic Disorders / Q000453:epidemiology*; D017678:Sex Distribution; D012893:Sleep Wake Disorders / Q000453:epidemiology; D013997:Time Factors; D055815:Young Adult