Decreasing tendency of seasonality in suicide may indicate lowering rate of depressive suicides in the population.

The seasonality of suicide is well known and a repeatedly demonstrated phenomenon. The authors analyzed the seasonality of 148 suicide events on Gotland between 1981 and 1996. A marked and significant seasonality with a spring and summer peak was found between 1981 and 1989, when the prescription of antidepressants was relatively low and stable. However, this seasonality disappeared in the period between 1990 and 1996, when prescription of antidepressants increased dramatically, indicating that more and more depressed patients were pharmacologically treated. As the seasonality of suicide in the population is the reflection of the seasonal nature of depressive suicides, the result suggests that a decreasing tendency of seasonality in suicide may indicate the lowering rate of depressive suicides in the given population.