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Seasonal Variation in Bipolar Disorder

Published online by Cambridge University Press:  02 January 2018

Timo Partonen  and
Jouko Lönnqvist
Timo Partonen*
Affiliation:
Department of Mental Health, National Public Health Institute, Helsinki, and Department of Psychiatry, University of Helsinki
Jouko Lönnqvist
Affiliation:
Department of Mental Health, National Public Health Institute, Helsinki
*
Dr T. Partonen, Department of Mental Health, National Public Health Institute, Mannerheimintie 160, FIN-00300 Helsinki, Finland
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Abstract

Background

In patients with bipolar disorder, admissions for manic and depressive episodes frequently display a seasonal pattern. We examined this variation and compared the patterns with the seasonal admission rates for schizophrenia.

Method

Patients with bipolar disorder or schizophrenia were identified from the Finnish Hospital Discharge Register of in-patient admissions to all psychiatric hospitals during the years 1969–91. They were included in the analysis if the first admission had occurred before 30 years of age. A total of 295 bipolar patients were found and a sample of 295 schizophrenic patients was randomly selected for comparison.

Results

There was no seasonal variation among all hospital admissions for bipolar disorder or schizophrenia However, the first admission for a depressive compared with a manic episode of bipolar disorder occurred significantly more often in the autumn (33% v. 21% respectively). The peak difference occurred during the week after the autumnal equinox in September.

Conclusion

Our findings suggest that there is no seasonal variation in bipolar disorder, although in some patients the clinical course might be influenced by the autumn, as far as the likelihood of a first admission for depression is concerned.

Type
Papers
Information
The British Journal of Psychiatry , Volume 169 , Issue 5 , November 1996 , pp. 641 - 646
Copyright
Copyright © Royal College of Psychiatrists, 1996 

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