The number of live-born children borne by women of a particular age group in a given period related to the average number of women in that age group and period.

As males age, their reproductive success typically declines. A study on fruit flies, led by University of Oxford researchers, ...

Between the lines: The overall decline in fertility rates as men age isn't as pronounced as it ... Brannigan says. For example, Brannigan had a patient who stopped drinking and smoking, lost ...

Countries will also age dramatically, with as many people turning 80 as there are being born. The fertility rate - the average number of children a woman gives birth to - is falling. If the number ...

The average number of live-born daughters that a group of women would have if the age-specific fertility rate were to apply to them in a given period (usually a calendar year).

Three types of analysis are performed by tfr2: (1) the computation of age-specific fertility rates and TFRs, as well as their standard errors, (2) the reconstruction of fertility trends, and (3) the ...