Population on 1 January (Eurostat definition): It is the inhabitants of a given area on 1 January of the year in question (or, in some cases, on 31 December of the previous year).

Source: The population is based on data from the most recent census, adjusted by the components of population change produced since the last census, or based on population registers.

Total mid-year population: The average population during a calendar year is generally calculated as the arithmetic mean of the population on 1 January of two consecutive years (it is also referred to as the mean population).

Overall dependency ratio: ratio of 0-14 and 65+ population to 15-64 population.

Child dependency ratio: ratio of population aged 0-14 to population aged 15-64.

Elderly dependency ratio: ratio of population aged 65+ to population aged 15-564.

Rate of natural population increase: The difference between the number of live births and the number of deaths in a given year divided by the mid-year population. This excludes changes due to migration and may be positive or negative (births minus deaths per 1,000 population, excludes changes due to migration).

Number of total births (Eurostat definition): a number including live births and stillbirths during the year

Live births (Eurostat definition): Births of children that showed any sign of life. It is the number of births excluding stillbirths.

Stillbirth (Eurostat definition): The expulsion or extraction from the mother of a dead foetus after the time at which it would normally be resumed capable of independent extrauterine existence (commonly taken to be after 24 to 28 weeks of gestation).

Crude birth rate: Number of live births per 1,000 mid-year population. (Eurostat definition): The ratio of the number of births during the year to the average population in that year. The value is expressed per 1000 inhabitants. EUROSTAT

Proportion of births to mothers under age 20: number of live births to mothers under age 20 as per cent of total live births.

Proportion of non-marital births: number of live births to non marriage mother as per cent of total live births.

Non-marital births to mothers under age 20: number of live births to non marriage mother under age 20 as per cent of live births to mothers under age 20.

Low-weight births: number of live births under 2,500 grams

Proportion of low-weight births: number of births under 2,500 grams as per cent of total live births.

Proportion of low-weight births among mothers under age 20: number of births under 2,500 grams as per cent of total live births to mothers under age 20.

Adolescent birth rate: Number of live births among women aged 15–19 per 1,000 mid-year female population in the same age group.

Total fertility rate (Eurostat definition): The mean number of children that would be born alive to a woman during her lifetime if she were to pass through her childbearing years conforming to the fertility rates by age of a given year.

Average age of females/males at first marriage (Eurostat definition): average age of females and males of those marrying for the first time.

Average age of females at time of first birth (Eurostat definition): the mean age of women when their children are born. For a given calendar year, the mean age of women at childbearing can be calculated using the fertility rates by age (in general, the reproductive period is between 15 and 49 years of age). Calculated in this way from the fertility rates by age, the mean age is not weighted, i.e. the different numbers of mothers at each age are not taken into account.

Induced abortions (no source): Termination of pregnancy induced for medical reasons or because of an elective decision to end the pregnancy; includes induced early foetal deaths and excludes spontaneous abortions (miscarriages).

Abortion rate: legally induced abortions per 100 live births.

Abortion rate per population: legally induced abortions per 1,000 women of specific age group.

Crude death rate: Number of deaths in a given year per 1,000 mid-year population.

Mortality rate: is a measure of the number of deaths (in general, or due to a specific cause) in a population, scaled to the size of that population, per unit time.

Mortality rate by specific age: This refers to the total number of deaths per year per 1000 people of a given age.

Maternal death (definition of World Health Organization, WHO): the death of a woman while pregnant or within 42 days of termination of pregnancy, irrespective of the duration and site of the pregnancy, from any cause related to or aggravated by the pregnancy or its management but not from accidental or incidental causes.

Infant (Eurostat definition): a child under one year of age.

Death (Eurostat definition): means the permanent disappearance of all evidence of life at any time after life birth has taken place (postnatal cessation of vital functions without capability of resuscitation).

Infant death (Eurostat definition): the death of a live-born infant who has not yet completed 1 year of life.

Infant mortality rate (per 1,000 live births) (Eurostat definition): The ratio of the number of deaths of children under one year of age during the year to the number of live births in that year. The value is expressed per 1000 live births.

Under-5 mortality rate (U5MR): The probability of dying between birth and exactly five years of age. Due to limitations of the data provided by the National Statistical Office to the MONEE project, the U5MR data in the TransMonEE database are calculated as the number of deaths among population under-five year of age in a given year, divided by the number of live births in the same year.

External cause of death/mortality (definition of World Health Organization): a death due to accidents and violence including environmental events, circumstances and conditions as the cause of injury, poisoning, and other adverse effects. Broad categories include:

  • accidents;
  • suicides;
  • medical misadventures or abnormal reactions;
  • homicide;
  • legal intervention;
  • injury from war operations.

Life expectancy at birth (Eurostat definition): The mean number of years that a newborn child can expect to live if subjected throughout his life to the current mortality conditions (age specific probabilities of dying).

Marital status (Eurostat definition): is the legally defined marital state. There are four types of marital status: single, married, widowed and divorced.

Marriage: is a social union or legal contract between people called a spouse that creates kinship. The definition of marriage varies according to different cultures, but is usually an institution in which interpersonal relationships, usually intimate and sexual, are acknowledged. Such a union is often formalized via a wedding ceremony.

Marriage and divorce data are based on the legal civil status as recognised by the law of each country.

Annual number of marriage: total number of marriages registered during the year.

Crude marriage rate: The ratio of the number of marriages during the year to the average population in that year. The value is expressed per 1000 inhabitants

Age-specific marriage rate: marriages per 1,000 mid-year population aged 15-44.

Divorce (or the dissolution of marriage): the final termination of a marital union, cancelling the legal duties and responsibilities of marriage and dissolving the bonds of matrimony between the parties (unlike annulment, which declares the marriage null and void). Divorce laws vary considerably around the world, but in most countries it requires the sanction of a court or other authority in a legal process.

Crude divorce rate: Number of registered divorces in a given year per 1,000 mid-year population.

General divorce rate: Number of registered divorces in a given year per 100 marriages. Rate of children affected by parental divorce: Number of children involved in a divorce per 1,000 population aged 0-17.

Immigrant: a person undertaking an immigration. ‘Immigration‘ denotes the action by which a person establishes his or her usual residence in the territory of a certain country for a period that is, or is expected to be, of at least 12 months, having previously been usually resident in another country.

Emigrant: a person undertaking an emigration. ‘Emigration‘ denotes the action by which a person, having previously been usually resident in the territory of a certain country, ceases to have his or her usual residence in this country for a period that is, or is expected to be, of at least 12 months.

Net external migration: immigrants minus emigrants. Immigrants: Either non-nationals arriving from abroad or nationals returning from abroad with the intention of residing in the country for a certain period. This period varies between countries

Net external migration rate: net migration per 100,000 mid-year population. The difference between immigration into and emigration from a given area during the year (net migration is negative when the number of emigrants exceeds the number of immigrants). Since most countries either do not have accurate figures on immigration and emigration or have no figures at all, net migration is generally estimated on the basis of the difference between population change and natural increase between two dates (in Eurostat's database it is then called corrected net migration). The statistics on net migration are therefore affected by all the statistical inaccuracies in the two components of this equation, especially population