- OVERVIEW OF POPULATION ISSUES. - 1 Definition of Population.. - Population is the number of people locating and living in a specific place ( area, nation, and continent). - Size of population. - Size of population in a specific location (area, nation, anf continent) is a total number of people living there in a certain time.. - To evaluate the development of population through years, sectoral experts use the ratio of development.. - The ratio of population development is measured by the number of percent of : P( Dece) P( December)- P( January). - The description of population development as following:. - Chart 2: Data of some countries with high number of population and average density than Vietnam, 2007.. - Number of male (female). - Ratio of male (female. - Number of man. - Ratio of gender. - x 100 Number of female. - Distribution of population according to gender plays an important role of society, economy, population and birth health.. - Ratio of dependants:. - Ratio of dependants. - Distribution of population:. - Distribution of population in terms of area, locations. - Ensuring the balance of population distribution enhances social development.. - Table 4: Distribution of population in Viet Nam. - x 1000 Average of population. - Number of children born by mother x years old. - ASFR x = ---x 1000 Number of mother x years old. - Number of death per year. - The ratio of increase. - The mortality ratio of child under 1 year old (IMR) The mortality ratio of child under 1 year old. - Ratio of below 1 year children (IMR). - History shows us that social reproduction of population are changing from high CBR and CDR(negative balance) to low CBR and CDR (positive balance), which leads to the change in population growth. - Ratio of birth 2. - Ratio of death 3. - Ratio of death