Family history of suicide among suicide victims

The aim was to compare the rates of suicide in family members of suicide victims and comparison subjects who died of other causes.

The Swedish cause of death register identified all suicides in subjects born between 1949 and 1969 (N=8,396). The comparison group comprised persons of the same age who died of other causes (N=7,568). First-degree relatives of the suicide victims (N=33,173) and comparison subjects (N=28,945) were identified.

Among families of the suicide victims there were 287 suicides, representing 9.4% of all deaths in family members. Among comparison families there were 120 suicides, 4.6% of all deaths. The difference was significant. Previous psychiatric care and suicide in a family member predicted suicide in the logistic regression model.

The rate of suicide was twice as high in families of suicide victims as in comparison families. A family history of suicide predicted suicide independent of severe mental disorder.