Australian Institute of Health and Welfare (2021) Dementia in Australia., AIHW, Australian Government, accessed 02 December 2021
Australian Institute of Health and Welfare. (2021). Dementia in Australia. Retrieved from https://www.aihw.gov.au/reports/dementia/dementia-in-aus
Dementia in Australia. Australian Institute of Health and Welfare, 20 September 2021, https://www.aihw.gov.au/reports/dementia/dementia-in-aus
Australian Institute of Health and Welfare. Dementia in Australia [Internet]. Canberra: Australian Institute of Health and Welfare, 2021 [cited 2021 Dec. 2]. Available from: https://www.aihw.gov.au/reports/dementia/dementia-in-aus
Australian Institute of Health and Welfare (AIHW) 2021, Dementia in Australia, viewed 2 December 2021, https://www.aihw.gov.au/reports/dementia/dementia-in-aus
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In addition to the underlying cause of death (UCOD), the National Mortality Database contains information on up to 19 associated causes of death (ACOD)—that is, other causes that were instrumental or significantly contributed to the death. This means that it is possible to examine not only people who die due to dementia (i.e. UCOD of dementia), but also people who die with dementia (i.e. UCOD or ACOD of dementia).
In 2019, 14,700 people died due to dementia (9,200 women and 5,400 men). In comparison, 26,100 people died with dementia (15,700 women and 10,400 men). This is an important difference as people who have dementia often have other health conditions, which may cause their death rather than dementia (Table S3.7).
In 2019, the leading underlying causes of death for people who had dementia recorded as an associated cause of death were:
As a person may have multiple types of dementia, it is possible for a person to have dementia recorded as both the underlying and associated cause of death. For example, a person may have Alzheimer’s disease as the underlying cause and Vascular dementia as an associated cause of death. Among the 11,700 people who died with at least 1 type of dementia recorded as an associated cause, 340 (2.9%) also had dementia recorded as the underlying cause of death (Table S3.9).
The leading underlying causes of death were fairly similar for men and women where dementia was an associated cause, but varied somewhat with increasing age— Accidental falls was more common with increasing age, whereas deaths due to Diabetes decreased with increasing age.
Figure 3.7 is a bar graph showing the leading 5 underlying causes of death in Australia by sex and age in 2019, when dementia was an associated cause of death. For both men and women, the leading underlying causes of death were Coronary heart disease, Cerebrovascular disease, Accidental falls, Parkinson’s disease and Diabetes. As age of death increases, Accidental falls becomes a more common underlying cause of death, whereas Diabetes becomes less common.
Between 2010 and 2019 the rate of deaths where dementia was the underlying cause of death increased from 35 to 40 deaths per 100,000 population. In contrast, the rate of deaths where dementia was an associated cause of death decreased from 45 to 33 per 100,000 population over the same period (Figure 3.8).
While we cannot be certain why this is occurring, it may be due to various factors:
Figure 3.8 is a line graph showing the number and age-standardised rates of dementia-related deaths in Australia between 2010 and 2019, by whether dementia was an underlying cause of death or an associated cause of death. The rate of deaths with dementia increased as an underlying cause of death and decreased as an associated cause of death between 2010 and 2019.
ABS (Australian Bureau of Statistics) 2015. Causes of death, Australia, 2013. ABS cat. no. 3303.0. Canberra: ABS.
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