Niklas Långström
Photo: Olle Sporrong
A new study from Sweden's Karolinska Institutet suggests that bipolar disorder - or manic-depressive disorder - does not increase the risk of committing violent crime. Instead, the over-representation of individuals with bipolar disorder in violent crime statistics is almost entirely attributable to concurrent substance abuse. The public debate on violent crime usually assumes that violence in the mentally ill is a direct result of the perpetrator's illness. Previous research has also suggested that patients with bipolar disorder - also known as manic-depressive disorder - are more likely to behave violently. However, it has been unclear if the violence is due to the bipolar disorder per se, or caused by other aspects of the individual's personality or lifestyle. The new study, carried out by researchers at Karolinska Institutet and Oxford University, is presented in the scientific journal Archives of General Psychiatry. Researchers compared the rate of violent crime in over 3,700 patients with bipolar disorder cared for in Swedish hospitals between 1973 and 2004 with that of 37,000 control individuals from the general public.
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