22. Population dynamics: natural movement, reproduction rates, physician's obligations in registration of vital events

Population dynamics. Natural movement of the population. Population reproduction rates. Physician’s obligations in the registration of vital events.

Population dynamics:

• Mechanical and natural movement of population
• In past 300-400 years population in European countries increased
• Today population size is relatively stable
• People emigrated in large numbers --> Mainly to America and Australia
• Present population in America and Australia are descendants of emigrants --> less natives
• World’s population now over 7 billion --> Expected to double in next 50 years

Natural movement of population:

• Natural movement includes processes, as vital events like birth and death
• These vital elements allow to calculate demographic indicators
• Used for assessment of demographic situations and projections of population development --> evaluation of population health status

Reproduction of population:

• Change of generation into a new one
• Measured by gross reproduction rates or net reproduction rates
• --> Indicate the ratio between sizes of mother’s and daughter’s generations
• If net reproduction rate calculated per one woman is less than one --> next generation is smaller
• Birth rate:
• Number of births per 1000 mid-year population in a given year
• Death rate:
• Number of deaths per 1000 mid-year population in a given year
• Average in the world is 10‰, critical rate is 20‰
• Average in Europe is 6-8‰

Physician’s obligations in the registration of vital events:

• Physician records these events --> documentation
• Statistical Data for national and international compare of vital events and social health
• Ability to make expectations and predictions about future population and population movement