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Methodological explonations
Crude birth rate is expressed in terms of average annual number of births during a calendar year. It is the ratio of number of live births to average annual population size and computed per 1000 population.
Age-specific fertility rates are computed as the number of total live births to women of specific age group in the current year to average annual number of women at corresponding age.
Average age of mothers at birth is determined by multiplication of average age of mothers at birth by birth rate by age during the current year. Quantity of average age of mothers is equal to average generation length of the stable population. Average age of mothers depends on net reproduction rate of the population and average annual increase of the stable population.
Births to mothers being at unregistered marriage are births to women whose marriages are not registered by Registration Office of the Ministry of Justice. Information on father in birth certification of child is defined based on joint application of mother and father or based on court decision on affiliation. Share of children from in result of unregistered marriages is calculated as ratio of all livebirth to number of children born in result of unregistered marriage.
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