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The impact of climate on risk of mania

Published online by Cambridge University Press:  23 March 2020

C.R. Medici ,
C.H. Vestergaard ,
D. Hadzi-Pavlovic ,
P. Munk-Jørgensen  and
G. Parker
C.R. Medici*
Affiliation:
Aarhus University Hospital, Psychiatric Research Academy, Department of Affective Disorders, Aarhus, Denmark Aarhus University Hospital, Department of Clinical Epidemiology, Aarhus, Denmark
C.H. Vestergaard
Affiliation:
Aarhus University, Research Unit for General Practice and Section for General Practice, Department of Public Health, Aarhus, Denmark
D. Hadzi-Pavlovic
Affiliation:
University of New South Wales, School of Psychiatry, Sydney, Australia Black Dog Institute, Research Unit, Sydney, Australia
P. Munk-Jørgensen
Affiliation:
Aarhus University Hospital, Risskov, Aarhus, Denmark
G. Parker
Affiliation:
University of New South Wales, School of Psychiatry, Sydney, Australia Black Dog Institute, Research Unit, Sydney, Australia
*
*Corresponding author.

Abstract

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Introduction

Bipolar disorder varies with season: admissions for depression peak in winter and mania peak in summer. Sunlight presumably increases the risk of mania through suppression of melatonin. If so, we expect admissions for mania to vary in accordance with climate variations.

Objectives

To investigate how climate and climate changes affects admissions for mania.

Aims

To identify which climate variables – sunshine, ultraviolet radiation, rain and snow cover – affect admissions for mania.

To examine whether year-to-year weather variation as well as long-term climate changes reflects the variation in number of admissions for mania.

Methods

This register-based nationwide cohort study covers all patients admitted for mania (ICD-10 code F31 or F30.0–F30.2) between 1995 and 2012 in Denmark. Climate data, obtained from the Danish Meteorological Institute, were merged with admission data and correlated using an Unobserved Component Model regression model.

Preliminary results

In total, 8893 patients were admitted 24,313 times between 1995 and 2012: 6573 first-admissions and 17,740 readmissions. Linear regression shows significant association between admissions per day and hours of sunshine (P < 0.01) and ultraviolet radiation (UV) dose (P < 0.01). Average days with snow cover and rain were not significantly correlated with admissions. Analyses on year-to-year variation and long-term change are not yet available.

Preliminary conclusions

Admissions for mania are correlated with sunshine and UV, but not rain and snow cover. If more patients are admitted during very sunny summers compared with less sunny summers this implies a relation with light itself and not just season.

Disclosure of interest

The authors have not supplied their declaration of competing interest.

Type
FC08
Information
European Psychiatry , Volume 33 , Issue S1: Abstracts of the 24th European Congress of Psychiatry , March 2016 , pp. S74
Copyright
Copyright © European Psychiatric Association 2016
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