Age Distribution: The percentage of the total population in each age category.

Age-Specific Birth Rate: For a given age, the annual number of births per 1000 women.

Age-Specific Death Rate: For a given age, the annual number of deaths per 1000 people.

Crude Birth Rate: The annual rate of child birth as a percentage of the total population.

Crude Death Rate: The annual rate of death as a percentage of the total population.

Demographic Transition: The slow parallel decline in the crude birth and death rates that historically appears to be a consequence of improving health and prosperity. The decline in birth rates precede the decline in deaths by a generation or more, resulting in a dramatic increase in the population size during the transition.

Infant Mortality: The number of deaths of children less than one year of age, per 1000 live births.

Life Expectancy: The number of years that a person of a given age can be expected to live, based on the age-specific mortality rates of the population.

Maternal Mortality Rate: The number of women who die of causes relating to child-bearing, per 100,000 live births.

Replacement Rate: The total fertility level that exactly balances births and deaths, so that the population growth rate is zero.

Total Fertility: The average number of children that each woman has in her lifetime.

Revised 11 January 2005.