Fertility and mortality
Data on population fertility and mortality provide information on number of births (in breakdown by sex, age of a mother, ethnicity, marital status of parents, etc.) and number of deaths (in breakdown by age, sex, ethnicity, citizenship etc.).
Concepts and definitions
Age-specific fertility rate
The average level of fertility of women at a definite age. The coefficient is calculated as the ratio of the annual number of live births to women in a given age group to the average annual number of women of this age.
For the calculation of the specific birth rate within the age group under 19 years, the annual average number of women aged 15–19 (including) is used as the denominator. To calculate the birth rate in the age group 15–49 years, the number of children born to women under and of 14 years of age as well as to those aged of and over 50 is also included. The coefficient is usually expressed per 1 000 women.
Crude birth rate
The ratio of the number of live births to the average number of population.
The rate is usually expressed per 1 000 people.
Total fertility rate
Number of births
The number of births registered in the Republic of Latvia during a year if at least one of the parents is classified as usually resident of the Republic of Latvia.
Starting from 2000, the number of births includes also children born to mother (usually resident of Latvia) while temporarily abroad. In line with the Statistical Office of the European Union (Eurostat) methodology, such children shall be included in the number of children born in Latvia.
Natural increase of population
Age-specific death rate
The mean level of mortality in a given age group of population.
It is computed as a ratio of the annual number of deaths occurring at a given age during a year to the average annual number of persons at a given age.
It is usually expressed per 1000 population.
Crude death rate
The ratio of the number of deaths to the average number of population.
The ratio is usually expressed per 1000 people.
Number of deaths
Number of deaths registered in the Republic of Latvia during a year.
The number of deaths is not adjusted if a person is declared to be dead after a longer time. The number of deaths includes also usually residents of Latvia passed away abroad.
Children deaths that occur within the first year of life.
As of 1991, the data on infant mortality are given according to the World Health Organization (WHO) methodology, which slightly differs from the methodology used before.
Deaths of infants under 28 days of life.
Neonatal mortality rate
The ratio of the number of deaths under 28 days of age to the number of live births. Usually expressed per 1 000 live births.
the mortality of viable foetuses and infants during the perinatal period (it is an interval from 22 completed weeks of gestation till the 7th day of infant’s life). It includes viable foetuses’ deaths before and in the process of deliveries (late foetal mortality) and infant deaths during the first week of life.
Perinatal mortality rate
A ratio of the number of stillbirths and deaths during the first week of life to the total number of live births and stillbirths. It is usually expressed per 1 000 births.
Infant mortality rate
Ratio of the number of deaths of children under one year of age to the number of live births in the corresponding period. The value is expressed per 1 000 live births
Gross reproduction rate
Gross reproduction rate (female) – the average number of daughters that would be born to a woman during her life-time subject to a set of age-specific birth rates observed in the years for which the rate is computed.
Net reproduction rate
Net reproduction rate (female) – the average number of daughters that would be born to a woman and live till the average age of mother if specific fertility and mortality rates of a given year would remain unchanged. A rate of 1.0 means each women generation is having exactly enough daughters to replace itself in the population.
Data collection and statistical processing
Survey method and source data
Data on population fertility and mortality are acquired from the Information System for Registration of Civil Status Documents of the Office of Citizenship and Migration Affairs.
The method used to obtain the information is a full-scope survey. It means that sampling method is not used for acquiring demographic statistics. Collection of data with the help of a full-scope survey allows publishing statistics in breakdown by each administrative territory of the country; it is not possible when using sampling method.
Fertility and mortality demographic coefficients are calculated per 1 000 average population of the corresponding period. If the total indicators are small, the rates can be calculated per 10 000 or 100 000 population.
Number of infant deaths includes children that have died during their first year of life. Data on infant mortality, starting from 1991, are given according to the WHO methodology, which slightly differs from the methodology used before.
In the second quarter of the following year monthly data of the previous year are updated in accordance with the specific date of event (during the year published in accordance with the registration date).
Information on fertility and mortality of population is compiled and published in compliance with:
- Classification of Administrative Territories and Territorial Units of the Republic of Latvia (CATTU);
- Classification of Ethnicities;
- International Standard for country codes and codes for their subdivisions (ISO 3166).
Contact person on methodology
Social statistics department Social statistics methodology section