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.