Psychiatry Investig.  2015 Jul;12(3):330-334. 10.4306/pi.2015.12.3.330.

There Is No Difference in IQ between Suicide and Non-Suicide Psychiatric Patients: A Retrospective Case-Control Study

Affiliations
  • 1Department of Psychology, Seoul National University, Seoul, Republic of Korea.
  • 2Department of Psychiatry, Asan Medical Center, Seoul, Republic of Korea.
  • 3Department of Psychiatry, Samsung Medical Center, Seoul, Republic of Korea. suhurhong@gmail.com

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.
CONCLUSION
These results do not support the existence of an association between IQ and suicide.

Keyword

IQ; Completed suicide; Case-control study; Intelligence
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