Citation

Yip PS, Yang KC, Qin P. J. Affect. Disord. 2006; 96(1): 117-121.

Affiliation

The Hong Kong Jockey Club Centre for Suicide Research and Prevention, The University of Hong Kong, Pokfulam, Hong Kong, China; Department of Statistics and Actuarial Science, The University of Hong Kong, Pokfulam, Hong Kong, China.

Copyright

(Copyright © 2006, Elsevier Publishing)

DOI

10.1016/j.jad.2006.05.012

PMID

16837061

Abstract

This paper studied the seasonality of suicides among persons with and without psychiatric illness in Denmark from 1970 to 1999. A non-homogenous Poisson process was used to examine the data. The seasonality of suicides was shown to be associated with gender and their psychiatric histories with a declining trend of suicide incidence noted over the captured period. A mild seasonal component was reported in the period of the late 70s to early 80s (1975-1984) among females who did not have any psychiatric treatment history, while in the 80s the significant seasonality was mainly contributed by male suicides without a psychiatric history. Another mild possible invoked seasonality in the 90s was in males who suffered from psychiatric illness. The rest could be treated as random events. Apparently, the seasonality among suicides with psychiatric illness exists but its effect could vary in different periods of time and among genders in Denmark.

Language: en