Incidence of Type 1 diabetes among people aged 15 years and over (AIHW)

From 2000 to 2009 there were 13,756 new cases of Type 1 diabetes among persons aged 15 and over—8,508 males and 5,248 females. This corresponds to an average annual rate of 9 new cases per 100,000 population, or over 3 new cases per day over this period.

Incidence by age and sex

The incidence rate of Type 1 diabetes was higher for younger people than for older people. The average annual rate of new cases of Type 1 diabetes was highest among 15–24 year olds at 15 per 100,000 people, followed by 25–39 year olds at 11 per 100,000. The average annual rate was lowest among those aged 40 and over, at 5 per 100,000.

From 2000 to 2009, the incidence rate for Type 1 diabetes among those aged 15 and over was higher for males than for females across all age groups. For males it was 11 new cases per 100,000 population, while for females it was 6 new cases per 100,000.

Figure 6: Average annual incidence rate of Type 1 diabetes among people aged 15 years and over, by age at first insulin use and sex, 2000–2009

Sources: National Diabetes Register and AIHW analysis of de-identified NDSS data (data extracted June 2011).

Trends in incidence

There was a decrease in the incidence rate of Type 1 diabetes for those aged 15 years and over in 2009, compared with the rate in 2000. The largest decrease over this time was among those aged 40 and over, where there were 3 new cases per 100,000 population in 2009 compared with 8 new cases per 100,000 in 2000.

Figure 7: Incidence rate of Type 1 diabetes among people aged 15 years and over, by year of first insulin use and age at first insulin use, 2000–2009

ndr 2009 - incidence of T1 diabetes by age group and year, all ages

Note: Age-standardised to the 2001 Australian population.

Sources: National Diabetes Register and AIHW analysis of de-identified NDSS data (data extracted June 2011).

Incidence by location

The average annual rate of new cases of Type 1 diabetes for those aged 15 and over for Australia was 8 new cases per 100,000 population. There was little variation in this rate by state or territory except for Western Australia and Tasmania where the rates were higher.

Figure 8: Average annual incidence rate of Type 1 diabetes among people aged 15 years and over, state or territory of current residence, 2000–2009

ndr 2009 - incidence of T1 diabetes by state

Notes
1. Age-standardised to the 2001 Australian population.
2. Data for the Northern Territory are not displayed due to data quality issues but are included in Australia.

Source: National Diabetes Register (data extracted June 2011).

Source data and methods

The source tables from which the charts in this section were created are in the Excel document Statistics from the 2009 National Diabetes Register (Tables 7, 8, 9, 10, 11 and 12) [200KB XLS].

The tables applicable to Type 1 diabetes for people aged 15 and over were produced using results from the National Diabetes Register that have been adjusted to account for missing cases using information from a de-identified National Diabetes Services Scheme dataset.

Adjusting the National Diabetes Register results in this manner ensures that more accurate incidence estimates are presented and that the estimates are not limited by the issues of coverage outlined in Appendix: Statistical notes and methods.

Incidence of Type 1 diabetes among people aged 15 years and over