Australia enjoys one of the highest life expectancies in the world – 83.2 years in 2023 for males and females at birth combined – and ranks seventh out of 38 countries among Organisation for Economic Co-operation and Development countries on this measure. Despite this, not all Australians fare equally well in terms of their health and longevity; for example, people living in rural and remote areas tend to have lower life expectancy and higher rates of disease and injury than people living in Major cities, and there are significant health disparities between First Nations people and non-Indigenous Australians.
Life expectancy is related to the average age at death within a population and is inversely related to the population death rates at that time; that is, the lower the death rates the greater the life expectancy. High life expectancy is often associated with low infant and child death rates, and access to high quality health care.
Death statistics are often based on the underlying cause of death only – that is, the disease or injury that initiated the train of events leading directly to death, or the circumstances of the accident or violence that resulted in the fatal injury.
Coronary heart disease is the leading underlying cause of death in Australia, followed by dementia including Alzheimer’s disease, cerebrovascular disease (including stroke), lung cancer and chronic obstructive pulmonary disease (COPD). The leading underlying causes of death are different at different ages, and by sex. In 2023, the leading cause of death for males was coronary heart disease, and for females, it was dementia including Alzheimer’s disease. Chronic diseases are more common causes of death among people aged 45 and over, while land transport accidents and suicides are leading causes among people aged 1–44.
In 2023, almost 4 in 5 deaths involved more than one cause. Multiple cause of death statistics considers all the causes or health events involved in a death, and can reveal common conditions that may not be identified when analysing the underlying cause of death alone. Multiple cause of death statistics also provide insight into the total impact of a disease. For example, in 2023 coronary heart disease was the underlying cause of death for 1 in 9 deaths (9.2%), but was involved in almost twice as many deaths (19.2%).
Multiple cause of death statistics use information recorded on the Medical Certificate of Cause of Death (MCCD) to provide insight on how conditions are involved in a death, such as those which arise from the underlying cause (direct causes of death) or those that significantly contributed to the death but were not in the chain of events leading to death (contributory causes of death). Understanding the different roles played by causes can inform other ways to target prevention strategies in addition to what is known about the underlying causes of death.
By examining differences over time in the number of people that die and their cause of death we can gain insight into the impact of changes in behaviours, exposures, and social and environmental circumstances.
See General Record of Incidence of Mortality (GRIM) books for data on long-term trends by causes of death. The Mortality Over Regions and Time (MORT) books provide deaths statistics by geographical areas for 2019–2023.
