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There Is No Difference in IQ between Suicide and Non-Suicide Psychiatric Patients: A Retrospective Case-Control Study
Sung-Jin Park1, Kikyoung Yi2, Joon Deuk Lee1
1Department of Psychology, Seoul National University, Seoul, Republic of Korea.
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.
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