title: The Netherlands study of depression in older persons (NESDO); a prospective cohort study.
abstract: BACKGROUND
  To study late-life depression and its unfavourable course and co morbidities in The Netherlands.
  
  
  METHODS
  We designed the Netherlands Study of Depression in Older Persons (NESDO), a multi-site naturalistic prospective cohort study which makes it possible to examine the determinants, the course and the consequences of depressive disorders in older persons over a period of six years, and to compare these with those of depression earlier in adulthood.
  
  
  RESULTS
  From 2007 until 2010, the NESDO consortium has recruited 510 depressed and non depressed older persons (≥ 60 years) at 5 locations throughout the Netherlands. Depressed persons were recruited from both mental health care institutes and general practices in order to include persons with late-life depression in various developmental and severity stages. Non-depressed persons were recruited from general practices. The baseline assessment included written questionnaires, interviews, a medical examination, cognitive tests and collection of blood and saliva samples. Information was gathered about mental health outcomes and demographic, psychosocial, biological, cognitive and genetic determinants. The baseline NESDO sample consists of 378 depressed (according to DSM-IV criteria) and 132 non-depressed persons aged 60 through 93 years. 95% had a major depression and 26.5% had dysthymia. Mean age of onset of the depressive disorder was around 49 year. For 33.1% of the depressed persons it was their first episode. 41.0% of the depressed persons had a co morbid anxiety disorder. Follow up assessments are currently going on with 6 monthly written questionnaires and face-to-face interviews after 2 and 6 years.
  
  
  CONCLUSIONS
  The NESDO sample offers the opportunity to study the neurobiological, psychosocial and physical determinants of depression and its long-term course in older persons. Since largely similar measures were used as in the Netherlands Study of Depression and Anxiety (NESDA; age range 18-65 years), data can be pooled thus creating a large longitudinal database of clinically depressed persons with adequate power and a large set of neurobiological, psychosocial and physical variables from both younger and older depressed persons.
authors.affiliation: Department Psychiatry/EMGO Institute for Health and Care Research, VU University Medical Center/GGZinGeest, Amsterdam, The Netherlands. h.comijs@ggzingeest.nl.
authors.forename: Hannie C
authors.initials: HC
authors.lastname: Comijs
authors.forename: Harm W
authors.initials: HW
authors.lastname: van Marwijk
authors.forename: Roos C
authors.initials: RC
authors.lastname: van der Mast
authors.forename: Paul
authors.initials: P
authors.lastname: Naarding
authors.forename: Richard C
authors.initials: RC
authors.lastname: Oude Voshaar
authors.forename: Aartjan Tf
authors.initials: AT
authors.lastname: Beekman
authors.forename: Marjolein
authors.initials: M
authors.lastname: Boshuisen
authors.forename: Janny
authors.initials: J
authors.lastname: Dekker
authors.forename: Rob
authors.initials: R
authors.lastname: Kok
authors.forename: Margot Wm
authors.initials: MW
authors.lastname: de Waal
authors.forename: Brenda Wjh
authors.initials: BW
authors.lastname: Penninx
authors.forename: Max L
authors.initials: ML
authors.lastname: Stek
authors.forename: Johannes H
authors.initials: JH
authors.lastname: Smit