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Genetic risk and outcome of psychosis (GROUP), a multi site longitudinal cohort study focused on gene-environment interaction: objectives, sample characteristics, recruitment and assessment methods

  • Nikie Korver
  • , Piotr J. Quee
  • , Heleen B. M. Boos
  • , Claudia J.P. Simons
  • , Lieuwe de Haan*
  • *Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Objective: A longitudinal focus on gene-environment vulnerability and resilience in both patients, their unaffected family members and non-related controls offers the opportunity to elucidate etiological and pathogenetic factors influencing the onset and course of psychotic disorders. The current paper delineates the objectives, sample characteristics, recruitment and assessment procedures of the Genetic Risk and Outcome of Psychoses (GROUP) study.

Methods: A naturalistic longitudinal cohort study with assessments at baseline, after three and six years of follow-up. The study is conducted by a consortium of four university psychiatric centres, with their affiliated mental health care institutions in the Netherlands covering more than 7.5 million inhabitants. Extensive assessment of genetic factors, environmental factors, (endo)phenotypes, and outcome.

Results: At baseline, 1120 patients, 1057 siblings, 919 parents and 590 healthy controls were included.

Conclusion: The GROUP study will contribute to insight in risk and protective factors in the aetiology of non-affective psychotic disorders, and in the variation in their course and outcome.
Original languageEnglish
Pages (from-to)205-221
Number of pages17
JournalInternational Journal of Methods in Psychiatric Research
Volume21
Issue number3
DOIs
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • Schizophrenia
  • methodology
  • gene
  • environment
  • interaction
  • aetiology
  • longitudinal

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