Fertility rate

The fertility rate is a Indice Statistique making it possible to measure the tendency of a population to increase or decrease naturally (i.e. without taking account of the Migratory flux).

Fertility rate general is calculated by submitting the report/ratio of the full number of alive children to the birth by the median number of fertile women (i.e. between 15 and 50 years) for a year given. This index is hardly any more used. The demographers use two other indicators rather: the indicator of the economic situation of fruitfulness (also called aggregative index of fruitfulness or median number of children per woman) and the final descent.

the indicating of the economic situation of fruitfulness is obtained by making the sum of fertility rates by age between 15 and 50 years measured a year given, by calling fertility rate by age the relationship between the number of live births resulting from the women from an age given to average manpower from the women from this age). This indicator measures the median number of children that women would have during their life if, at any age, their level of fruitfulness were that of the year considered.
the final descent is measured in each generation: it is quite simply the median number of children whom the women of this generation, who lived up to 50 years, had.

Le threshold of renewal, i.e. the median number of children per woman to which a population is maintained on the same level, is approximately 2,1 children by woman in the developed countries (i.e. countries where almost all the newborns manage to the age of procreation in capacity to make children).

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