Changing seasonality of birth--a possible environmental effect.
نویسندگان
چکیده
منابع مشابه
Changing seasonality of birth--a possible environmental effect.
STUDY OBJECTIVE Seasonality of birth was examined to determine whether this has changed over the last half century. DESIGN Time-series analysis was carried out on retrospective data, both for the full 50 year period and for the five decades within that period. Although the primary objective was to investigate seasonality by fitting an appropriate model and examining changes over the period st...
متن کاملCanadian birth seasonality and its possible association with seasonal brightness
This paper tests whether atmospheric brightness is related to Canadian birth seasonality ten-eleven months earlier. Births and visibility (brightness) are correlated nation-wide and in nine provinces/ cities. For the national correlation, r=0.928. Therefore, seasonal brightness provides a plausible explanation for inter-annual changes in seasonality, and may reconcile divergent viewpoints. Easy...
متن کاملthe effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
Seasonality 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...
متن کاملSeasonality 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 کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Epidemiology & Community Health
سال: 1993
ISSN: 0143-005X
DOI: 10.1136/jech.47.5.362