Triiodothyronine (T3) related to conduct disorder in a forensic psychiatric population

The present study evaluates the relatioships between the thyroid hormones, triiodothyronine (T3) and thyroxine (FT4), in adult life and a history of c onduct disorder in 61 men from a forensic psychiatric population. The study population was divided into four groups based on the presence or not of an assessed conduct disorder, as well as a previous child psychiatric contact . The highest T3 values were found in patients with both a previous conduct disorder and a previous child psychiatric contact. There was a positive re lationship between conduct disorder and serum levels of FT4. These results may indicate that T3 is a biological marker of aggressive behaviour in chil dren.