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Season of Birth in the Population of Norway, with Particular Reference to the September Birth Maximum

Published online by Cambridge University Press:  29 January 2018

Ørnulv ØDegård
Ørnulv ØDegård*
Affiliation:
University of Oslo, Gaustad Psychiatric Hospital, Box 16 Gaustad, Oslo 3, Norway
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Abstract

The monthly number of births in Norway fluctuates between a maximum in January–May and a minimum in October–December. This cyclic seasonality is assumed to be of biological origin, but indirectly it is influenced by social factors and consequently tends to vary a great deal. There is a secondary birth maximum in September, corresponding to a peak of conceptions during the traditional festivities around Christmas and New Year. It is shown that this maximum is much less variable within the country studied, though it probably varies from one country to another in relation to the impact of the mid-winter traditions.

The January–May birth maximum is known to be higher in schizophrenia than in the general population, while no such difference is observed in Norway for the September birth peak. It is felt that there is a fundamental difference between the two birth maxima and a corresponding difference between schizophrenic patients and the general population. Minimal paranatal brain damage of seasonal origin is suggested as an explanation.

Type
Research Article
Information
The British Journal of Psychiatry , Volume 131 , Issue 4 , October 1977 , pp. 339 - 344
Copyright
Copyright © Royal College of Psychiatrists, 1977 

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References

Barry, Herb & Barry, Herb. Jr (1964) Season of birth in schizophrenia. Archives of General Psychiatry, 11, 385–91.Google Scholar
Dalén, Per (1974) Season of Birth in Schizophrenia. Gøteborg 1974, Gotab, Kungälv.Google Scholar
Hare, E. H., Price, John & Slater, E. (1974) Mental disorder and season of birth: a national sample compared with the general population. British Journal of Psychiatry, 124, 81–6.Google Scholar
Mednick, S. A. (1970) Breakdown in individuals with high risk of schizophrenia: possible dispositional perinatal factors. Mental Hygiene, 54, 50–63.Google Scholar
Ødegård, Ø. (1974) Season of birth in the general population and in patients with mental disorder in Norway. British Journal of Psychiatry, 125, 397–405.Google Scholar
Parker, Gordon & Neilson, Megan (1976) Mental disorder and season of birth. British Journal of Psychiatry, 129, 355, 361.CrossRefGoogle ScholarPubMed
Samaroff, A. J. & Zak, M. (1972) Neonatal factors in serious mental disorder. Neuroscience Research Programme Bulletin, 10, 423–5.Google Scholar
Shimura, M., Nakamura, I. & Miura, T. (1977) Season of birth of schizophrenics in Tokyo, Japan. Acta psychiat., scand, 55, 225–32.Google Scholar
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