Explanatory Notes on Main Statistical Indicators

Households　include family household (including single household) and collective households.

Total Population　refers to the total number of people alive at a certain point of time within a given area.

Population Birth Rate　refers to the ratio of the number of births to the average population during a certain period of time (usually a year) in a certain region, which is often expressed in ‰.The following formula is used:

In this formula, number of births refers to live births, i.e. the births babies had showed any vital phenomena regardless of the length of pregnancy, and annual average number of population refers to the average number of the beginning and end of the year (also can be replaced by midyear population).

Number of Births　refers to live births, i.e. the births babies had showed any vital phenomena regardless of the length of pregnancy.

Death Rate　refers to the ratio of the number of deaths to the average population (or mid-period population) during a certain period of time (usually a year) which is often expressed in ‰. The following formula is used:

Natural Growth Rate of Population　refers to the ratio of natural increase in population (number of births minus number of deaths) in a certain period of time (usually a year) to the average population (or mid-period population) to the same period which is often expressed in ‰. The following formula are applied:

 or:  Natural Growth Rate of Population = Birth Rate – Death Rate

Sex Ratio　is the indicator reflects the ratio of the population of male to female in total population or various age groups. Generally, it is often expressed in the ratio of male population to 100 female. The calculating formula:

Permanent Population　includes:

1. the population living in the local countries, towns or streets, and registered as permanent residences in the local countries, towns or streets.

2. the population having been living in the local countries, towns or streets for more than half a year, with the permanent residences outside the local countries, towns or streets.

3. the population having been living in the local countries, towns or streets for less than half a year, but having been apart from the countries, towns or streets where registered their permanent residences for more than half a year.

4. the population living in the local countries, towns or streets, with undetermined residences.

5. the population once living in the local countries, towns or streets, working or studying in foreign countries now, and without permanent residences temporarily.

City Population　refers to the population living in the urban area. Urban area refers to the municipal districts, the cities without district being set up, the neighborhood committees connected with the actual construction of governments of districts and cities and other areas.

Town Population　refers to the population living in the town areas. The town area refers to the seat of town governments and other town beside the urban areas, the neighborhood committees connected with the seat of governments and other areas.

Total Household Registered Population  refers to the population of citizens registered permanent residence in the public security household registration authorities of their permanent living places in accordance with the Regulations of the People's Republic of China on Residence Registration. Those who registered permanent residence are counted as household registered population, whether and how long they go out.

Urban Household Registered Population   refers to the household registered population in the urban areas.

Composition of Birth　refers to the ratio of the number of births of a certain composition to the total births in the same period  during a certain period of time (usually a year).

Household Size　refers to the size of a family, or the number of family members.