Explanatory Notes on Main Statistical Indicators
Permanent
Population
refers to the total number of people alive at a given area over half a
year. According to the regulation of population census and sample survey,
permanent resident population include (1) registered population in this area
except those who have left this area over half a year (exclude those going
abroad to work or study). (2) population with residence
registered in other area, but having actually resided in this area over half a
year or having left place of residence registration over half a year and
resided in this area during the period of population survey. (3) population with residence registration in this enumeration
area not yet settled, i.e. residence card on hand, migration certificate, birth
certificate, demobilized soldier card, release certificate, etc.
Population
Density
refers to the total number of people within unit land area. Usually, population
density is calculated with permanent resident population and indicates crowd
degree of population. It is often expressed in the number of people per square
kilometer. The following formula is used:
Birth
Rate (or Crude Birth Rate)
refers to the ratio of the number of births to the average population (or
mid-period population) during a certain period of time (usually a year),
expressed in ��. Birth rate in the chapter refers to annual birth rate. The
following formula is used:
Number of births in the formula refers to
live births, i.e. when a baby has breathed or showed any vital phenomena
regardless of the length of pregnancy. Annual average population is the average
of the number of population at the beginning of the year and that at the end of
the year. Sometimes it is substituted by the mid-year population.
Death
Rate (or Crude 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), expressed
in ��. Death rate in the chapter refers to annual death rate. 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) of the same period, expressed in ��. The following formula is applied:
Total
Dependency Ratio
refers to the ratio of children aged 0-14 and elderly population aged 65 and over to the working-age population aged 15-64. It describes in general the number of non-working-age population that every 100 people at working ages will take care of. The following formula is used:
Legal
Marriage Age, Labour Age Population
The standard of legal marriage age is 22 for male and 20 for female. The domestic standard of ��reaching labour age��, ��within labour age�� and ��over labour age�� are 16, 16 to 59, 60 for male respectively and 16, 16 to 54, 55 for female respectively; the international standard of these items are 15, 15-64 and 65 respectively for both male and female.