How is the health status of Australians measured and described?
Indicators used to measure and understand health status, including incidence, prevalence, morbidity, burden of disease, DALY, YLL, YLD, life expectancy, health-adjusted life expectancy and mortality rates
VCE HHD Unit 3 AoS 1 guide to health status indicators - incidence, prevalence, morbidity, mortality, burden of disease and the DALY.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this dot point is asking
This dot point wants you to define each health status indicator, know what it measures, and use the right indicator to interpret and compare the health of populations. In the exam you are often given a data table or graph and asked to identify trends or explain differences using these terms correctly.
Core indicators
Health status is an individual's or population's overall level of health, taking into account various measured aspects such as life expectancy and disease.
Incidence is the number or rate of new cases of a condition during a specific period. Prevalence is the total number or proportion of cases of a condition present in a population at a particular time. A long-lasting condition can have low incidence but high prevalence.
Morbidity refers to ill health in an individual and levels of ill health in a population, often expressed as a rate. Mortality refers to death, particularly at a population level. Maternal mortality is death of a mother during pregnancy, childbirth or shortly after; infant mortality is death of a baby before its first birthday; under-five mortality is death before the fifth birthday.
Life expectancy is an indication of how long a person can expect to live; it is the number of years of life remaining to a person at a particular age if death rates do not change. Health-adjusted life expectancy (HALE) is the average number of years a person can expect to live in full health, taking into account years lived in less than full health due to disease or injury.
Burden of disease and the DALY
Burden of disease is a measure of the impact of diseases and injuries, specifically it measures the gap between current health status and an ideal situation where everyone lives to old age free of disease and disability. It is measured in DALYs.
DALY (disability-adjusted life year) is a measure of burden of disease; one DALY equals one year of healthy life lost due to premature death and time lived with illness, disease or injury. The DALY is made up of two parts:
- YLL (years of life lost) - the fatal burden, the years lost due to premature death.
- YLD (years lost due to disability) - the non-fatal burden, the years of healthy life lost due to illness, injury or disability.
So DALY = YLL + YLD.
Using indicators to compare populations
These indicators let you describe Australia's health status and compare population groups. A group with a lower life expectancy, higher mortality rate and higher burden of disease has poorer health status. When you interpret data, quote the figure, name the indicator, and state the direction of the trend (higher, lower, increasing, decreasing).
When a question gives you data, choose the indicator that the data actually shows. Do not call a death rate "morbidity" or describe burden of disease without mentioning DALYs.
Exam-style practice questions
Practice questions written in the style of VCAA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
2023 VCAA2 marksDescribe the term Disability Adjusted Life Year (DALY) as a measure of health status. (2 marks)Show worked answer →
For 2 marks give the definition plus what it captures.
A DALY is a measure of burden of disease: one DALY equals one year of healthy life lost due to illness, injury or premature death (1 mark). It is calculated by adding the years of life lost due to premature death (YLL) and the years lost due to disability or living with illness (YLD), so DALY = YLL + YLD (1 mark). A higher number of DALYs indicates a greater burden of disease and therefore poorer health status. Markers reward the idea that one DALY is one lost year of healthy life and that it combines both fatal and non-fatal burden.
2023 VCAA1 marksDescribe mortality. (1 mark)Show worked answer →
For 1 mark: Mortality refers to death, particularly at a population level. It is usually expressed as a mortality rate, meaning the number of deaths in a population in a given period, often per 1000 or per 100000 people. A full-mark response names that it refers to deaths in a population (commonly expressed as a rate) rather than just saying "death".
2022 VCAA4 marksDescribe how the overconsumption of alcohol has an impact on two indicators of health status. (4 marks)Show worked answer →
Four marks: choose two distinct health status indicators and explain the impact of alcohol on each (2 marks each). Name each indicator.
Indicator 1 - morbidity (2 marks): Overconsumption of alcohol increases ill health and disease in the population, for example raising rates of liver cirrhosis and alcohol dependence, which increases morbidity.
Indicator 2 - mortality (2 marks): Alcohol contributes to deaths from causes such as road traffic accidents, alcohol-related liver disease and some cancers, which increases the mortality rate. Other acceptable indicators include burden of disease/DALY (alcohol adds years of healthy life lost) or life expectancy (heavy drinking reduces average life expectancy). Each chosen indicator must be correctly named and clearly linked to a consequence of excess alcohol.