Sex ratio of births conceived during wartime
نویسندگان
چکیده
منابع مشابه
Sex ratio of births in Ireland in 1978.
DATA AND METHODS The data for Northern Ireland for the years 1922-1978 were obtained from the Annual Reports of the Registrar General for Northern Ireland'. For the years 1913 to 1921 the data were obtained from the Second Annual Report of the Registrar General (Northern Ireland), 19232. Provisional data for 19793 were provided by the General Register Office for Northern Ireland. The data for t...
متن کاملTrends in the sex ratio of California births, 1960-1996.
STUDY OBJECTIVE The male sex ratio at birth (or the proportion of male births in a population) has been suggested as a sentinel environmental health indicator. Usually around 51%, the proportion may be dramatically decreased in offspring of persons with chemical exposures. Recent publications from the USA and elsewhere have noted a small but apparently declining male birth proportion, suggestin...
متن کاملThe sex ratio of human births related to maternal age.
Data from the Annual Reports of the Registrar-General for England an d Wales (1939-1947) and for Scotland (1939-1947) were examined to determine the relationship of sex ratio to maternal age. Sex ratios of total births and live births decrease with maternal age; sex ratios of stillbirths increase. The increase in the sex ratio of stillbirths with maternal age accounts for the difference betwe...
متن کاملMultiple births conceived by assisted reproductive technology in Korea
PURPOSE The recent trends of multiple births (MBs) conceived by assisted reproductive technology (ART) in Korea were analyzed as well as the relationship with maternal age, especially advanced maternal age. METHODS Data were obtained from the Korean Statistical Information Service and annual ART reports from the ART committee of the Korean Society of Obstetrics and Gynecology. RESULTS MBs i...
متن کاملAnalysing data on the sex ratio of human births by cycle day of conception.
Analysing data on the sex ratio of human births by cycle day of conception Walters (2000) is correct: pooling data from a set of 2ϫ2 frequency tables is (except under some conditions) invalid. Whether these conditions are fulfilled in the present instance will not be discussed though (as will be seen) they may be suspected of being approximated. He describes a method for simultaneously analysin...
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ژورنال
عنوان ژورنال: Human Reproduction
سال: 2004
ISSN: 1460-2350
DOI: 10.1093/humrep/deh027