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Definition of concepts

Average maternity age
Average age at which children are born to mothers, weighted by rates at each age. The numerator is the sum of the product at each age for each of the fertility rates and the denominator, the sum of the rates.
Short-term fertility rate (average number of children per woman)
Reference number that is calculated by adding the fertility rates per age and represents the number of children that a generation of women would have if the fertility rates per age were to remain stable as observed at any given moment. The number of children actually born to generations of women fluctuates less than that calculated by the short-term indicator, which is highly sensitive to changes in the fertility "calendar" (for example, a rejuvenation of the average age of mothers leads to a major increase in the indicator, while a delay in the average age implies a sharp decrease).
Fertility rate
Live births per 1,000 women of each age.

Methodological aspects

The Births Statistics provide information on the births, deliveries and late foetal deaths of people residing in Catalonia according to their demographic and social characteristics.

The original source of the data are the statistical bulletins on births involving women living in Catalonia who are registered in civil registers. Until 2011, the data refers to the registrations made in Catalonia of people who reside there. From 2012 onwards, it includes all events involving residents in Catalonia who have been registered in other autonomous communities.

From 2012 onwards, the data is reported annually in two phases: the provisional data, based on events concerning residents registered with civil registries of Catalonia, and the definitive data, with events concerning all residents (including those registered with civil registries in other autonomous communities).Idescat draws up these statistics in collaboration with the INE, based on the delivery records of the Civil Registry.

Unavailable information is represented using the symbol ":". When the value is lower than that of the minimum unit to be able to estimate the statistical operation or if it effects statistical confidentiality, the symbol used is "..".