نتایج جستجو برای: fertility preservationkb
تعداد نتایج: 49419 فیلتر نتایج به سال:
BACKGROUND While recent studies have indicated that fertility has remained high in Uganda, no systematic attempt has been made to identify the factors responsible for this persistent trend and to quantify these factors. This paper uses the Uganda Demographic and Health Surveys (UDHS) of 2006 and 2011, to examine the contribution contraceptive use, marriage and postpartum infecundability on one ...
European continent has been for-runner in the demographic transition process. Age-specific fertility patterns had changed tremendously during this process in Europe. However, it is still mainly concentrated in the female age group 20 – 34 years. Women and couples tend to limit fertility in marginal age groups of female's reproductive period. In this paper the author addresses late agespecific f...
According to life-history theory, any organism that maximizes fitness will face a trade-off between female fertility and offspring survivorship. This trade-off has been demonstrated in a variety of species, but explicit tests in humans have found a positive linear relationship between fitness and fertility. The failure to demonstrate a maximum beyond which additional births cease to enhance fit...
Recent studies in sub-Saharan Africa have shown that fertility is reduced among HIV-infected women compared with uninfected women. The size and pattern of this fertility reduction has important implications for antenatal clinic-based surveillance of the epidemic and also for estimates and projections of the demographic impact of the epidemic. This paper examines the association between HIV and ...
Cultural variables in economic analysis have recently experienced a strong renewal. This evolution sheds a new light on the old debate between the "Beckerian Model" of fertility and the "Synthesis Model" of fertility. In this paper, I propose a fertility model making the long run evolution of culture endogenous. The whole population is divided into two alternative cultures corresponding to spec...
Introduction It is now widely recognised that reduced fertility in dairy herds is one of the most important factors affecting producer profitability. Roche (2006) has defined the effect of infertility on profitability as: (i) prolonged calving interval with fewer calves and less milk per cow; (ii) increased replacement costs; (iii) increased labour, semen and veterinary bills; and (iv) an exten...
Against a backdrop of two new developments in the fertility behavior of the Mexican-Origin population in the U.S., the present discussion will update contemporary Mexican-Origin fertility patterns and address several theoretical weaknesses in the current approach to immigrant group fertility. Data come from six national surveys (three from Mexico and three from the U.S.) that cover a twenty-fiv...
The protective association between having older siblings and the risk of subsequent allergic disease may be due to decreased fertility among women with allergic disease. In this study, the authors compared fertility rates among women with asthma, eczema, or hay fever with those in the general female population. Computerized primary-care data from the United Kingdom were used to conduct a cohort...
This paper compares nonparametric fertility rates for American women in stepfamilies and intact families using data from the June 1995 Current Population Survey. Results show that childbearing behaviors in stepfamilies resemble those in intact families. Regardless of stepfamily status, timings and levels of fertility for second and third marital births are identical for all women at the same li...
Family Matters No.63 Spring/Summer 2002 Australian Institute of Family Studies 14 gradual fertility decline from 1.91 in 1990 to 1.73 in 2001. Overall, the fertility rate has halved from 3.55 to 1.73 in a period of just 40 years. Changes in fertility do not occur in isolation from other social, cultural and economic changes. Although it is often difficult to establish cause and effect patterns,...
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