Results 211 to 220 of about 51,081 (259)
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Epidemiology, 1998
Animal studies have shown evidence of prenatal hormonal interaction between unlike sexed fetuses, including reduced fertility among females. We evaluated whether the fecundability of female twins is different from that of singletons and whether it differs according to the sex of the co-twin.
Christensen, Kaare +6 more
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Animal studies have shown evidence of prenatal hormonal interaction between unlike sexed fetuses, including reduced fertility among females. We evaluated whether the fecundability of female twins is different from that of singletons and whether it differs according to the sex of the co-twin.
Christensen, Kaare +6 more
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On the heterogeneity of fecundability
Lifetime Data Analysis, 1996We propose to use a general mixing distribution in modeling the heterogeneity of the fecundability of couples. We introduce a sequence of parameters called canonical moments, which is in one to one correspondence with the moments, to characterize the mixing distribution.
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Studies in Family Planning, 1980
The current hypothesis that malnutrition impairs fecundity has recently been challenged by a number of investigations that examined the nutrition fecundity link. The controversy is important because of the potential implications for food aid programs for developing countries. If improving nutrition improves increases birth rates this would exacerbate
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The current hypothesis that malnutrition impairs fecundity has recently been challenged by a number of investigations that examined the nutrition fecundity link. The controversy is important because of the potential implications for food aid programs for developing countries. If improving nutrition improves increases birth rates this would exacerbate
openaire +2 more sources
New England Journal of Medicine, 1982
Studies have shown that fertility (defined as number of live births) declines with age in women. However it is not known to what extent other factors such as male reproductive capacity and coital patterns affect this decrease. Male fecundity may also decline with age and coital frequency is believed to decline with length of marriage.
A H, DeCherney, G S, Berkowitz
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Studies have shown that fertility (defined as number of live births) declines with age in women. However it is not known to what extent other factors such as male reproductive capacity and coital patterns affect this decrease. Male fecundity may also decline with age and coital frequency is believed to decline with length of marriage.
A H, DeCherney, G S, Berkowitz
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Fertility, Fecundity, Fecundability
Abstract Fertility, fecundity, and fecundability are all terms used to describe aspects of the human capacity to conceive. These terms can be confusing, especially because they are not used in consistent ways. Despite the importance of reproduction to individuals and to society, there is no accurate way to assess this capacity at the ...openaire +1 more source
Sterility and fecundability estimation
Journal of Theoretical Biology, 1983The percentage of steriles and the fecundability of non-steriles among a given population can be estimated by a probabilistic model from observations made on delays to first conception. The maximum likelihood method of estimation that was used takes into account all available information, though some of these observations may be incomplete due to a ...
P, Maruani, D, Schwartz
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Population Studies, 1967
Abstract A computerized probability model of family-building, FERMOD, is described and then utilized in an investigation of relations between family planning and fecundity as applying to white couples of the contemporary United States. Models of this type that formulate reproductive performance as a stochastic process permit one to explore relations ...
R G, Potter, J M, Sakoda
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Abstract A computerized probability model of family-building, FERMOD, is described and then utilized in an investigation of relations between family planning and fecundity as applying to white couples of the contemporary United States. Models of this type that formulate reproductive performance as a stochastic process permit one to explore relations ...
R G, Potter, J M, Sakoda
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The decline of fecundity with age
Maturitas, 1988PIP: Historical studies all indicate a decline in fertility with age. The artificial insemination data from a program carried out in France since 1973 related to women whose husbands were permanently sterile because of azoospermia. During the first 2 cycles only 1 insemination was performed per cycle using frozen semen from married donors aged 45 years
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The fecundability of U.S. women
Population Studies, 1973Abstract In this note I shall define fecundability as the probability that a non-pregnant woman will achieve a recognizable pregnancy during a month of exposure to risk.
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