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Population density is the average population per square kilometer of
          the territory.
                Population density is calculated by dividing the population (at time
          point or average population) of a certain residential area to the area of that
          territory.
                Population  density  can  be  calculated  for  the  entire  country  or  region
          (rural, urban, socio-economic region), for each province, district, commune, etc.
          in order to reflect the population distribution by geography at a given time.
                Formula:

                           Populationn density    =   Population
                                          2
                              (persons/km )         Territory area
                Number of households

                Household is a social unit, comprising either one person living alone
          or a group of people living in the same dwelling and sharing meals together.
          For households with 2 persons or over, its members may or may not share a
          common budget; or be related by blood or not; or in combination of both.
                Sex ratio of the population reflects number of males per 100 females.
          Sex ratio of the population is determined by the following formula:
                           Sex ratio           Total of males
                       of the population    =   Total of females   × 100

                Crude birth rate

                Crude birth rate indicates that for every 1,000 people, how many live
          births are in the reference period.

                Formula:
                                                 B
                                 CBR (‰)  =          × 1000
                                                Ptb

                Where:

                CBR: Crude birth rate;
                B: Total live births in the reference period (total of children were born
          alive in the reference period);
                Ptb: Population up to the reference time-point.

                Total fertility rate (TFR)




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