Seasonality of coitus and seasonality of birth
نویسندگان
چکیده
منابع مشابه
Seasonality of birth and acute lymphoblastic leukemia.
Sir, There is a growing body of evidence that exposure to infection is a risk factor for childhood leukemia. Recent epidemiological studies have suggested that environmental hazards (including infections), before or around birth, may also be associated with the risk of leukemia. In addition, a cyclic trend in occurrence could be interpreted as supportive evidence of exposure to infection. Vario...
متن کاملSeasonality of birth in seasonal affective disorder.
BACKGROUND Season of birth or seasonal changes in putative etiologic factors are thought to influence the development of several psychiatric illnesses. The aim of this investigation was to examine seasonal differences in the frequency of birth in a clinical sample of patients with seasonal affective disorder (SAD). METHOD 553 outpatients suffering from SAD-DSM-IV-defined depressive disorder w...
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The persistence of psychosis at a high and relatively constant prevalence in the various populations of the world is rendered difficult to explain by the absence of identified environmental precipitants and by reduced fertility of affected individuals. The problem is not confined to schizophrenia but applies also to affective disorder. The 'virogene' concept attempts to explain this paradox as ...
متن کاملSeasonality of birth in nineteenth- and twentieth-century Austria.
We present an analysis of birth seasonality in nine geographical regions within Austria for two time periods, 1881-1912 and 1947-1959. In the early period, geography, climate, and agricultural patterns were related to birth seasonality. By the latter time period, these factors were no longer related to birth seasonality. We propose a "resilience hypothesis," which suggests two levels of causal ...
متن کاملSeasonality of birth and conception to teenagers in Texas.
We study the births to teenagers during the years 1964-2000 and analyze separately the three main racial/ethnic groups in Texas (White, Hispanic, and African American), as well as married and unmarried teens during the years 1994-2000. By using traditional statistical methods of analysis and a filter based on the multiresolution wavelet analysis, we draw inferences about the times of the year w...
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ژورنال
عنوان ژورنال: Demography
سال: 1967
ISSN: 0070-3370,1533-7790
DOI: 10.2307/2060307