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 Mean age of women at birth of first child (Year)
Characteristic Description
Name Mean age of women at birth of first child (Year); Annual
Regularity Annual
Source Statistics Portugal, Demographic indicators
First available period 1980
Last available period 2023
Dimensions
  • Data reference period
  • Place of residence (NUTS - 2013)
Concepts
  • RESIDENT POPULATION:  Set of persons who, regardless of being present or absent in a given housing unit at the moment of observation, have lived in the place of their usual residence for a continuous period of 12 months prior to the moment of observation, or have arrived to the place of their usual residence during the period of 12 months prior to the moment of observation, with the purpose of living there for a year, at least.
  • GENERAL FERTILITY RATE:  The ratio of the number of live births during a given period, usually a calendar year, to the average women of child-bearing age (aged 15 to 49) in that period (usually expressed as the number of live births per 1000 (10^3) women of child-bearing age).
  • REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).
  • BIRTH ORDER:  The number of previous live births of a woman plus the birth which has just occurred.
Definition Being i the age of the woman at the birth of the first child; t the reference calendar year and f1it the fertility rate at birth of the first child, at age i, at time t.
Formule

`[(sum_(i=5)^(i=49)(f1 i,t x (i+0,5)))] / (sum_(i=15)^(i=49)(f1 i,t))`
Measure unit (symbol) Year (Year)
Power of 10  0
Observations For a given calendar year, the mean age of women at first child can be calculated using fertility rates by age, between 15 and 49 years, conventionally defined as the reproductive period, for first births.
Last update date 18/06/2024


information presented in 17/7/2024