title: Mortality and life expectancy in persons with severe unipolar depression.
abstract: BACKGROUND
  Depression is a common psychiatric disorder, with a lifetime prevalence of 10-15% in the Danish population. Although depression is associated with excess mortality, it is not yet understood how this affects life expectancy. Our aim was to examine mortality rates and life expectancy in patients with unipolar depression compared to the general population, and to assess the impact of comorbid somatic illness and substance abuse.
  
  
  METHODS
  We followed a Danish population-based cohort from 1995-2013 (N=5,103,699). The cohort included all residents in Denmark during the study period. Mortality rate ratios (MRRs) and life expectancy in persons with unipolar depression were calculated using survival analysis techniques.
  
  
  RESULTS
  The overall MRR was 2.07 (95% Confidence Interval (CI): 2.05-2.09) in people with a previous unipolar depression diagnosis compared to the general Danish population. This excess mortality translated into a reduced life expectancy of 14.0 years in men and 10.1 years in women (assuming onset at age 15). The MRR was highest for death due to suicide and accidents (MRR: 4.66; 95% CI: 4.53-4.79), but the absolute number of deaths was highest for natural causes.
  
  
  CONCLUSIONS
  People with unipolar depression have a significant shorter life expectancy, especially men.
authors.affiliation: National Centre for Register-based Research, Department of Economics and Business, Aarhus University, Denmark.
authors.forename: Thomas Munk
authors.initials: TM
authors.lastname: Laursen
authors.affiliation: National Centre for Register-based Research, Department of Economics and Business, Aarhus University, Denmark; Department of Mental Health, Bloomberg school of Public Health, Johns Hopkins University, Baltimore, USA.
authors.forename: Katherine L
authors.initials: KL
authors.lastname: Musliner
authors.affiliation: Mental Health Centre Copenhagen, University of Copenhagen, Denmark.
authors.forename: Michael E
authors.initials: ME
authors.lastname: Benros
authors.affiliation: Research Unit for General Practice, Department of Public Health, Aarhus University, Denmark.
authors.forename: Mogens
authors.initials: M
authors.lastname: Vestergaard
authors.affiliation: National Centre for Register-based Research, Department of Economics and Business, Aarhus University, Denmark.
authors.forename: Trine
authors.initials: T
authors.lastname: Munk-Olsen
mesh_terms: D016022:Case-Control Studies; D002423:Cause of Death; D015897:Comorbidity; D017281:Cost of Illness; D003718:Denmark / Q000453:epidemiology; D003866:Depressive Disorder / Q000453:epidemiology* / Q000401:mortality*; D006801:Humans; D008017:Life Expectancy; D012727:Sex Characteristics; D019966:Substance-Related Disorders / Q000453:epidemiology*; D016019:Survival Analysis