title: There Is No Difference in IQ between Suicide and Non-Suicide Psychiatric Patients: A Retrospective Case-Control Study.
abstract: OBJECTIVE
  The goal of this study was to examine the association between IQ and suicide in psychiatric patients.
  
  
  METHODS
  We conducted a nested case-control study using data obtained from psychiatric patients affiliated with a general hospital in Seoul, Korea. In a one-to-two ratio the psychiatric patients who died of suicide (Suicide Group; n=35) were matched to those who didn't (Non-suicide Group; n=70) by age, gender, psychiatric diagnosis and approximate time of first treatment. IQ was measured using the Korean version of the Wechsler Adult Intelligence Scale-Revised.
  
  
  RESULTS
  There were no significant differences in any type of IQ between suicide patients and non-suicide patients. Logistic regression showed no evidence of an association between IQ and suicide.
  
  
  CONCLUSIONS
  These results do not support the existence of an association between IQ and suicide.
authors.affiliation: Department of Psychology, Seoul National University, Seoul, Republic of Korea.
authors.forename: Sung-Jin
authors.initials: SJ
authors.lastname: Park
authors.affiliation: Department of Psychiatry, Asan Medical Center, Seoul, Republic of Korea.
authors.forename: Kikyoung
authors.initials: K
authors.lastname: Yi
authors.affiliation: Department of Psychology, Seoul National University, Seoul, Republic of Korea.
authors.forename: Joon Deuk
authors.initials: JD
authors.lastname: Lee
authors.affiliation: Department of Psychiatry, Samsung Medical Center, Seoul, Republic of Korea.
authors.forename: Jin Pyo
authors.initials: JP
authors.lastname: Hong
keywords: Case-control study; Completed suicide; IQ; Intelligence