Abstract:
BACKGROUND:The influence of seasons on mood disorders is controversial. OBJECTIVE:To examine monthly variations in admissions for mania and depressions including variations with sex and age and correlations with frequencies of suicides. METHODS:All admissions for mania or depression (N=4341) in a population of 1,800,000 with 35,285 admissions in the years 1992-1996 were analysed. All 14,503 suicides in Norway the years 1969-1996 were also analysed. RESULTS:Admissions for depression had a significant monthly variation for women (chi(2)=29.78, df=11, P<0.005) with the highest peak in November and for men (chi(2)=19.69, df=11, P<0.05) with the highest peak in April. Among women increasing age correlated negatively with the range of monthly observed/expected ratios (r(s)=-0.943, N=6, P<0.01) and with a of maximal monthly observed/expected ratio (r(s)=-0.943, N=6, P<0.01). Among men suicides correlated with admissions for depression (r=0.647, N=12, P<0.05) and mania (r=0.678, N=12, P<0.05). LIMITATIONS:The time of admission to hospital are not identical to onset of affective episode. The study was done retrospectively. No sociocultural or physical environmental data were investigated. CONCLUSION:A hypothesis of an influence of seasons on mood disorders is supported. Younger women seem to be especially vulnerable.
journal_name
J Affect Disordjournal_title
Journal of affective disordersauthors
Morken G,Lilleeng S,Linaker OMdoi
10.1016/s0165-0327(00)00373-6subject
Has Abstractpub_date
2002-05-01 00:00:00pages
39-45issue
1-3eissn
0165-0327issn
1573-2517pii
S0165032700003736journal_volume
69pub_type
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