This paper aims to investigate the main socio­economic determinants of female age at first marriage in Chuadanga dis­ trict, Bangladesh, over the year 2005, and attempts to find some explanations for the differences in the age at marriage among socio­ economic characteristics. The findings of the multiple classification analysis (MCA) suggest that among all the variables analyzed in...

BACKGROUND As more women choose to delay childbearing, increasing numbers of them face age-related fertility problems. We aimed to explore the association between age and diagnosed causes of female infertility. METHODS Anonymized data (age of male and female partner, year of first visit, diagnosis, duration and type of infertility) were obtained on all couples attending Aberdeen Fertility Cen...

In humans, the fertility in female declines slowly from the age of 30 years [1,2]. Embryo implanting ability and survival start declining gradually after 30 years of age, but by more than two thirds after 40 years and in younger women with reduced ovarian reserve [3]. While decline in the frequency of intercourse is one of the reasons, reduction in the quality of either the embryos arising from...

19 1. How much should an individual invest in reproduction as it grows older? Answering 20 this question involves determining whether individuals measure their age as the time 21 left for future reproduction or as the rate of deterioration in their state. Theory 22 suggests that in the former case individuals should increase their allocation of 23 resources to reproduction as opportunities for ...

younger birds laying slightly smaller eggs in each position within the laying sequence. Some physiological maturation process was probably responsible for the smaller eggs younger birds laid because the pattern held within individuals. However, changes in egg size and shape may be due to breeding experience rather than age itself. We detected no evidence for age-specific differences in egg size...