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Confinement of winter birth excess in schizophrenia to the urban-born and its gender specificity.

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Bibliographic Details
Title:	Confinement of winter birth excess in schizophrenia to the urban-born and its gender specificity.
Authors:	O'Callaghan, Eadbhard, Cotter, David, Colgan, Karen, Larkin, Conall, Walsh, Dermot, Waddington, John L., O'Callaghan, E (AUTHOR), Cotter, D (AUTHOR), Colgan, K (AUTHOR), Larkin, C (AUTHOR), Walsh, D (AUTHOR), Waddington, J L (AUTHOR)
Source:	British Journal of Psychiatry. Jan95, Vol. 166, p51-54. 4p.
Subjects:	Schizophrenia, Childbirth, Winter, People with schizophrenia, Seasons, Psychoses
Abstract:	Background: The season of birth phenomenon in schizophrenia was reexamined in relation to place of birth, in order to test the hypothesis that a seasonal factor might operate preferentially among those who were urban-born.Method: The seasonal distribution of births was examined among 3253 patients in two case registers having an ICD-9 diagnosis of schizophrenia and compared with the distribution of births among the normal population born in those catchment areas over the same period; those subjects born in population centres greater than 50,000 were defined as urban-born.Results: Patients who were urban-born showed an excess of winter births relative to controls that was absent among their rural-born counterparts. On comparing patient groups, those who were urban-born were more likely to be born in the winter, while those who were rural-born were more likely to be born in the spring; this urban-rural distinction was confined essentially to female patients.Conclusions: These findings might be accommodated most readily in terms of a spatially as well as seasonally varying environmental factor that is associated with urbanicity and to which female offspring are more vulnerable. [ABSTRACT FROM AUTHOR]
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Database:	Psychology and Behavioral Sciences Collection

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