The Australian Bureau of Statistics (ABS) estimates that the Australian population amounts to just under 19 million people. Of those 19 million Australians, the 1998 ABS study on Disability, Ageing and Carers estimated that there were 3.6 million people with a disability (19% of the total population).
The 1999 Australian Institute of Health and Welfare (AIHW) study on The definition, incidence and prevalence of acquired brain injury in Australia, estimated that there were 338,700 Australians (1.9% of the total Australian population) who had a disability related to acquired brain injury. Of these, 160,200 were severely or profoundly affected by acquired brain injury a needed daily support.
This figure can be compared with the AIHW estimate of 328,000 people with in intellectual disability (1.86% Australians). Of these people 178,000 people required daily assistance.