BACKGROUND: The influence of seasons on @entity1316 is controversial. OBJECTIVE: To examine monthly variations in admissions for @entity162 and @entity308 including variations with sex and age and correlations with frequencies of suicides. METHODS: All admissions for @entity162 or @entity308 (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 @entity308 had a significant monthly variation for @entity1 (chi(2)=29.78, df=11, P<0.005) with the highest peak in November and for @entity1 (chi(2)=19.69, df=11, P<0.05) with the highest peak in April. Among @entity1 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 @entity1 suicides correlated with admissions for @entity308 (r=0.647, N=12, P<0.05) and @entity162 (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 @entity1316 is supported. Younger @entity1 seem to be especially vulnerable.

Seasonal variation in suicides and in admissions to hospital for @entity162 and XXXX .

@entity1 :: ('9606', 'Species') :: ['women', 'men'] @entity1316 :: ('MESH:D019964', 'Disease') :: ['mood disorders'] @entity162 :: ('MESH:D001714', 'Disease') :: ['mania'] @entity308 :: ('MESH:D003866', 'Disease') :: ['depression', 'depressions']
@entity308 :: (MESH:D003866,Disease) :: ['depression']
