Census Coverage Survey (CCS)

To account for people and households who may not have been counted by the census, or who may have been counted more than once or counted in the wrong place, a Coverage Assessment and Adjustment (CAA) methodology was used to identify the number of people and households affected and to adjust the 2011 Census estimates accordingly.

Baby boom

Baby booms are short-term increases in birth rates, and have been recorded following the two World Wars and during the late 1950s to early 1960s. The children born during these events are often termed ‘baby boomers’ and the impact on population figures when the baby boomers themselves have children has been termed the ‘Echo Effect’.

Age-specific fertility rates

The Age Specific Fertility Rate (ASFR) is the number of live births per 1,000 women of a specific age in a specified period. For example, the age-specific fertility rate for 25-29 year old women in 2010 is calculated by dividing the number of births in 2010 to women aged 25-29 by the estimated population of women of that age in that year.


Age is derived from the date of birth question and is a person's age at their last birthday. Dates of birth that imply an age over 115 are treated as invalid and the person’s age is imputed. Infants less than one year old are classified as 0 years of age.


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