3-9

3-9. Overweight and Obesity

Introduction

3-9-1. Overweight and Obesity in South Australia – by Local Health Network

3-9-2. Overweight and Obesity in South Australia – by age and sex

3-9-3. Overweight and Obesity in South Australia – by socio-economic status

3-9-4. Overweight and Obesity in Australia – by state and territory

3-9-5. Overweight and Obesity – Aboriginal people

Sources

 

Introduction

Body mass index (BMI) is a measure of body fat based on the ratio of weight and height (bodyweight in kilograms divided by height in metres squared). The normal range of BMI for an adult is 18.5 to 24.9 kg/m2. 'Overweight' is defined by the World Health Organisation as a BMI in the range of 25 to less than 30. 'Obesity' is a BMI of 30 or higher.

For overweight and obesity rates in children, please refer to Chapter 2-11.

 

3-9-1. Overweight and Obesity in South Australia – by Local Health Network

  • In 2018, around two-thirds (66.9%) of South Australians aged 18 years or more were either overweight or obese1.
  • The rate varies between the local health networks (LHNs) from 59.2% in the Central Adelaide LHN to 82.7% in the Flinders and Upper North LHN1.
  • The overweight/obesity rate among Country SA residents (72.9%) is statistically significantly higher than the metropolitan Adelaide rate (64.4%)1.
  • No time series is available for this indicator due to a change in survey methods. In 2018, SA Health discontinued the South Australian Monitoring and Surveillance System (SAMSS) and moved to the improved South Australian Population Health Survey (SAPHS). Results between the collections are not comparable.

 

Overweight or obese (aged 18+ years), 2018
Local Health Network %
Northern Adelaide 67.8%
Central Adelaide 59.2%
Southern Adelaide 67.1%
Metropolitan Adelaide 64.4%
Barossa Hills Fleurieu 63.7%
Eyre and Far North 78.2%
Flinders and Upper North 82.7%
Limestone Coast 78.8%
Riverland Mallee Coorong 78.5%
Yorke & Northern 73.9%
Country SA LHN 72.9%
South Australia 66.7%
Australia n.a.

Note: Data are weighted which can result in rounding discrepancies.

Data source: SA Health 2020

 

3-9-2. Overweight and Obesity in South Australia – by age and sex

  • In 2018, the proportion of males aged 18 years and over who were overweight or obese (73.1%) was statistically significantly higher than the corresponding female rate (60.8%)1.

 


Overweight or obese (aged 18+ years), 2018
Age (years) Males Females
18-24 49.4% 38.7%
25-34 63.2% 38.9%
35-44 75.5% 64.1%
45-54 82.0% 70.3%
55-64 85.2% 69.2%
65-74 79.2% 69.7%
75+ 64.0% 66.3%
All ages 73.1% 60.8%

3-9-2

Note: Data are weighted which can result in rounding discrepancies.

Data source: SA Health 2020

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3-9-3. Overweight and Obesity in South Australia – by socio-economic status

  • There is a statistically significant inverse correlation between the proportion of people aged 18 years and over who are classified as overweight or obese and the socio-economic status of the area in which they live1.

 

Overweight or obese (aged 18+ years), 2018
Socio-economic status (SES) %
Lowest SES 72.9%
Low SES 66.9%
Middle SES 66.2%
High SES 64.8%
Highest SES 61.7%

3-9-3

Note: Data are weighted which can result in rounding discrepancies.

Data source: SA Health 2020

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3-9-4. Overweight and Obesity in Australia – by state and territory

  • The data below comes from the Australian Bureau of Statistics’ 2017-18 National Health Survey. It is therefore not directly comparable to the information presented in 3-9-1 to 3-9-3 above which is sourced via the South Australian Population Health Survey.
  • However, the national survey is broadly in line with results from the state-specific survey, with 68.3% (age standardised) of South Australians aged 18 years and over self-reporting a body mass index (BMI) that classifies them as overweight or obese2.
  • Nationally, the South Australian overweight/obesity rate is slightly above the Australian average of 66.4% (age standardised), and is ranked second-highest of the states and territories2.

 

Overweight or obese (aged 18+ years), 2017-18 (age standardised)
State/Territory %
Australian Capital Territory 64.1%
Queensland 65.2%
New South Wales 65.4%
Northern Territory 65.5%
Western Australia 66.2%
Victoria 68.0%
South Australia 68.3%
Tasmania 69.3%
Australia 66.4%

3-9-4

Data source: ABS 2018

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3-9-5. Overweight and Obesity – Aboriginal people

  • In 2018-19, 70.9% of Aboriginal people in South Australia aged 15 years and older had a body mass index (BMI) classified as overweight or obese3.
  • This is roughly comparable to the 68.3% (age standardised) overweight/obesity rate recorded for all South Australians aged 18 years or more in the ABS 2017-18 National Health Survey (see 3-9-4 above)2.
  • South Australia's overweight/obesity rate for Aboriginal people is also roughly comparable to the national average for Aboriginal people (71.2%)3.

 

Aboriginal people overweight or obese (aged 15+ years), 2018-19 (crude rates)
State/Territory %
Northern Territory 59.0%
Australian Capital Territory 67.3%*
Queensland 70.0%
South Australia 70.9%
Western Australia 73.2%
Victoria 73.4%
New South Wales 73.6%
Tasmania 75.5%
Australia 71.2%

3-9-5

* Estimate has a high margin of error and should be used with caution

Data source: ABS 2019

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Sources

  1. Based on South Australian Population Health Survey customised extract 2020, Prevention and Population Health, SA Health, Adelaide, 3 February 2020.
  2. Based on Australian Bureau of Statistics (ABS 2018), ‘Table 2.3 Summary health characteristics — States and territories, Proportion of persons’, National Health Survey: First Results, 2017-18, cat. no. 4364.0.55.001, 12 December 2018.
  3. Based on Australian Bureau of Statistics (ABS 2019), 'Table 3.3 Selected health characteristics, by State/Territory, Aboriginal and Torres Strait Islander persons, 2018–19, Proportion of persons,' National Aboriginal and Torres Strait Islander Health Survey, 2018-19, cat. no. 4715.0, 11 December 2019.