title: Abstracts of trials presented at the Vth World Congress of Psychiatry (Mexico, 1971): a cohort study.
abstract: BACKGROUND
  Systematic reviews should identify all relevant trials in order to minimize the potential for bias and the play of chance in their results. Other specialities have shown that conference proceedings are a rich source of trials, but many of these trials are never fully published.
  
  
  METHODS
  All clinical trials presented at a single conference (Vth World Congress of Psychiatry, Mexico, 1971) were identified by hand searching. Full publications of these abstracts were then sought on five databases by searching for the authors or relevant key words.
  
  
  RESULTS
  Full publications were found for 46% of the abstracts. The odds of publication decreased for abstracts that were from a non-Anglophone country or that failed to mention randomization.
  
  
  CONCLUSIONS
  Anyone wishing to undertake a systematic review of a mental-health care topic should search relevant conference proceedings for trials.
authors.affiliation: Cochrane Schizophrenia Group, Oxford.
authors.forename: K
authors.initials: K
authors.lastname: Diezel
authors.forename: F M
authors.initials: FM
authors.lastname: Pharoah
authors.forename: C E
authors.initials: CE
authors.lastname: Adams
mesh_terms: D002986:Clinical Trials as Topic; D015331:Cohort Studies; D016206:Databases, Bibliographic; D006801:Humans; D001523:Mental Disorders; D008800:Mexico; D011570:Psychiatry; D012107:Research Design