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J Affect Disord. 1998 Feb;48(1):63-8.

The incidence and onset-age of hospitalized bipolar affective disorder in Finland.

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1
Department of Psychiatry, University of Oulu, Finland.

Abstract

BACKGROUND:

Some studies have indicated that there are wide variations on incidence and prevalence of bipolar disorder in specific populations.

METHODS:

The occurrence of bipolar affective disorder and the age at onset was studied in both genders among the hospitalized Finnish population.

RESULTS:

The annual rate of all hospitalized patients with bipolar disorder was 0.03%. Of these, 2% were under 20 years, 14% under 30 years, 61% under 50 years and 81% under 60 years of age. The 1-year incidence was highest in the age group 50-59 years in males and 40-49 years in females.

CONCLUSIONS:

The low prevalence and incidence of bipolar disorder in Finland may be due to late onset-age.

LIMITATION:

The study is based on hospital-treated bipolar disorder patients.

CLINICAL RELEVANCE:

We have presented previously unreported differences between the age of onset of bipolar disorder in Finland compared with other countries.

PMID:
9495603
[Indexed for MEDLINE]
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