MEAN AGE AT FIRST MARRIAGE
The mean age at first marriage is the weighted average of the age specific rates of first marriage.

MARITAL STATUS
Marital status refers to the (legal) conjugal status of each individual in relation to the marriage laws or customs of the country (de jure status). For this classification all persons living in consensual unions should be classified as single, married, widowed or divorced in accordance with their de jure status. However, in order to better reflect changing lifestyles, for countries that record data on cohabiting couples, this data is added.

Definition source: Recommendations for the 2000 censuses of population and housing in the ECE region, UNECE and Eurostat

MEAN AGE OF WOMEN AT FIRST BIRTH
The mean age of women at first birth is the weighted average of the age specific rates of first order births.

MAIN ECONOMIC SECTORS
Using the International Standard Classification (ISIC Rev.2 1968 or Rev.3 1990) the economy is divided into three branches: 1) agriculture, 2) industry, and 3) services.

From ISIC Rev.2 the following are grouped together:

• Agriculture = Major group 1
• Industry = Major groups 2-5
• Services = Major groups 6-9, 0

From ISIC Rev.3:

• Agriculture = Categories A and B
• Industry = Categories C to F
• Services = Categories G to Q

Definition source: ISIC, UN

MUNICIPAL LEVELS
Local administrative levels as defined by each country. The administrative levels as referred to by the NUTS might serve as a starting point for EU and candidate countries.

MID-YEAR POPULATION
Estimate of the total number of persons present in the country (de facto population) on 1 July of the year indicated.