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Aust N Z J Psychiatry. 1996 Apr;30(2):220-2.

Season of birth and schizophrenia: southern hemisphere data.

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1
Department of Psychiatry, University of the Witwatersrand Medical School, Parktown, Johannesburg, South Africa.

Abstract

OBJECTIVE:

The association between winter birth and increased incidence of schizophrenia is well documented in the northern hemisphere. The present study examined season of birth and schizophrenia in a southern hemisphere population from a mild temperate climate.

METHOD:

The seasonal incidence of birth in schizophrenic patients was compared, using Chi-squared tests, to normative population birth rates.

RESULTS:

A statistically significant seasonal pattern, with a peak in late spring and early summer, was obtained.

CONCLUSION:

This supports northern hemisphere findings regarding calendar month, but not season, of excess schizophrenic births. This has implications for viral and other aetiological hypotheses dependent on meteorological factors.

Comment in

PMID:
8811264
DOI:
10.3109/00048679609076097
[Indexed for MEDLINE]
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