Suicide among young Australians, 1964-1993: an interstate comparison of metropolitan and rural trends
Michael J Dudley, Norman J Kelk, Tony M Florio, John P Howard and Brent G H Waters
MJA 1998; 169: 77-80 Abstract -
Introduction -
Methods -
Results -
Discussion -
Acknowledgements -
References -
Authors' details
See also Rosenman
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©MJA1998
Abstract |
Objectives: (i) To compare suicide rates in 15-24
year old men and women; and (ii) for 15-24 year old men, to investigate
differences in suicide rates between metropolitan and rural areas,
and changes in method-specific suicide rates and, in particular,
firearm and hanging suicide rates in rural and metropolitan
areas. Design: Retrospective analysis of Australian Bureau of Statistics (ABS) suicide data (1964-1993). Setting: All Australian States. Subjects: Young women and men aged 15-24 years who died by suicide. Results: Male youth suicide rates rose substantially over the 30 years in all Australian States, whereas female rates did not increase. Increases in suicide rates in young men in small rural towns consistently exceeded those in metropolitan areas in all Australian States. Metropolitan rates in 1964 were higher than those in small rural towns, but by 1993 the position was reversed. Medium-sized cities were the only areas where there was no consistent interstate trend. Differences were noted in suicide base rates in different States. High car exhaust suicide rates were noted in Western Australia, and high firearm suicide rates in Tasmania and Queensland. The ratio of firearm suicide rates in small rural areas to those in metropolitan areas rose in all mainland States, but the same ratio for hanging suicide rates changed little. Conclusions: All Australian States reflect national suicide trends in relation to sex and residential area. In some States, particular suicide methods predominate. A decreasing trend in overall firearm suicide rates in young men in all States from 1984 to 1993 conceals substantial increases in firearm suicide rates in small rural areas in all mainland States over the 30-year period. This, together with the marked rate ratio difference in firearm suicides between metropolitan and small rural areas, suggests that particular risk factors for suicide are operating in small rural areas. The fact that hanging rate ratios changed little suggests that more general factors in male youth suicide are also operating in all areas. A better understanding of similarities and differences in health risks faced by metropolitan and rural youth is required. |
Introduction |
Suicide rates for 15-24 year old Australian men have trebled since the
early 1960s. However, these rate increases have not been uniform. In
metropolitan areas they have doubled, but they have increased as much
as 12-fold in towns with fewer than 4000 people. The rates for suicide
with a firearm in 15-24 year old men have declined overall, and in
metropolitan areas since the late 1980s, but they have continued to
rise in rural areas. Rates of suicide by hanging have risen in all
locations.1 We aimed to answer questions about whether these national suicide trends are replicated at the State level. We wanted to know whether the trends for the larger States dominate the national picture, or whether the same fundamental trends are occurring in all States. Interstate analysis is also important, because health, education and welfare services are often organised and funded at a State level. Differences among the States have long been part of the Australian culture, and firearms legislation, in particular, is at present a State prerogative. In this article, we report suicide rates in young men and women (aged 15-24 years) in all Australian States and Territories, as well as suicide rates in young men by method of suicide, and by residential area, in all States, for 1964 to 1993. |
Methods |
Our methods are described in more detail elsewhere.1 Data on suicides and corresponding
population data for subjects aged 15-24 years were sought from the
Australian Bureau of Statistics (ABS) for the years 1964-1993. These
data were de-identified, and an undertaking was given not to attempt
to identify the subjects or to contact their families. Data
concerning usual area of residence were available for all but 219 of
8537 people who had died by suicide. Subjects' usual place of
residence was classified as:
These cut-offs, chosen after consulting social geographical sources,2,3 approximate Australian urban groupings in order of size. Definitions of "metropolitan" and "rural" also follow guidelines given in these sources. Rates throughout are expressed as numbers of suicides per 100 000 of the at-risk population. Data were aggregated in 5-year epochs to enable longer-term trends to be discerned. |
Results | |
Sex-specific suicide rates |
Suicide rates in 15-24 year old men rose substantially over the past 30
years in all Australian States and Territories, but rates in women of
the same age did not (Figure 1).
We will consider suicide rates in 15-24 year old men only in the remainder of the article. |
Method-specific suicide rates | Considering the whole 30-year period, for 15-24 year old men, a clear trend exists, both nationally and for individual States, of a reduction in firearm suicide rates in the past 10-15 years, and of an increase in hanging suicide rates over the whole period at a substantially greater rate than the increase by all other methods. Car exhaust suicide rates also increased at a greater rate than the overall increase, especially in Western Australia, but to a lesser extent than suicide by hanging. Suicides by poisoning did not increase proportionally in any States or nationally. Hanging is now the most common method of youth suicide in most States, exceeding firearms as a means of suicide in all States except Queensland and Tasmania. In the most recent epoch, firearm suicide rates were highest in Tasmania and Queensland (Figure 2). |
Residence-specific suicide rates |
In all States, suicide rates in 15-24 year old men have increased
substantially in metropolitan areas, but the greatest increases
have been recorded for towns with a population under 4000. In 1964 in
four States (New South Wales, Victoria, Queensland, Western
Australia), metropolitan suicide rates exceeded those of small
rural areas, but by 1993 the position was reversed (Figure 3).
New South Wales Victoria Queensland South Australia Western Australia Tasmania |
Firearm and hanging suicide rates for metropolitan and small rural areas | Suicide with firearms or by hanging, the most common methods, account for between a half and two-thirds of suicides in 15-24 year old men in each State, so these have been analysed by place of residence. In all States the ratio of the firearms suicide rate in small rural areas to the firearms suicide rate in metropolitan areas rose substantially over the 30-year period. In contrast, this ratio for suicide rates by hanging remained much the same or rose minimally over the same period. Thus, the national trend for a reduction in firearm suicide rates conceals a continuing rise in firearm suicide rates in rural areas in all States. These increases were especially pronounced in Victoria and Queensland (41.5- and 36.7-fold respectively), while Tasmania's rates remained high throughout the period (Figure 4). |
Discussion |
National youth suicide trends according to sex of the subject are
reflected in the rates of all the individual States: suicides in 15-24
year old men rose substantially, whereas those in 15-24 year old women
did not change in the past 30 years. The disproportionate increase in
suicide rates in young men in small rural areas nationally is also
occurring consistently in all Australian States.
Certain data limitations should be noted.
However, it is unlikely that changing coronial verdicts account for the magnitude or generality of the changes we noted. Cantor and Coory5 found that Queensland's provincial cities and rural towns of modest size had negligible rate increases compared with metropolitan and major urban areas from 1986 to 1991. They questioned whether there was a rural suicide problem in Queensland. Our study confirms their observations for Queensland cities with populations over 25 000, but notes a massive rate increase in towns with fewer than 4000 people, with substantial numbers supporting this finding. Further, the Queensland picture does not appear to be atypical. There are differences in suicide base rates in the various States. Whether Melbourne's low base rate in 1964 is coincidental, or a result of Victorian coroners showing less willingness to reach a verdict of suicide, requires further investigation. Tasmania's relative isolation, demographically stable population, and easy firearm access may explain its consistently high suicide rates. Suicide methods differ somewhat between States. The high rates for car exhaust suicides in Western Australia may reflect its relative isolation and this method's cultural acceptability. Carbon monoxide sensors, exhaust modifications and changes to catalytic converters may be effective prevention measures.6 High firearm suicide rates among 15-24 year old men in Tasmania and Queensland,7 rising metropolitan firearm suicide rates in those States, and rising rates in small towns (population, <4000) in all States, but especially Victoria and Queensland, probably relate to falling populations in small rural areas with stable or rising suicide numbers, the easy availability of firearms, and the more liberal firearm legislation in Tasmania and Queensland. Applying methods to prevent car exhaust suicide and reducing the availability of guns may reduce suicide rates by these two methods, and possibly total suicide rates.8 While rates for suicide by various methods may differ in different States, residential area trends for firearm and hanging suicides were pronounced in all States. A trend for overall firearm suicide rates to decrease in all States from 1984-1993 conceals substantial firearm rate increases in small rural areas in all mainland States over the 30-year period. Differences in rates between metropolitan and small rural areas, and the fact that the ratio of firearms suicide rates in small rural areas to those in metropolitan areas rose substantially in all mainland States, suggest that particular risk factors (directly and indirectly related to firearms) are operating in small rural areas. Restrictive legislation may differentially affect firearm suicides in metropolitan areas, where availability is lower.9 The rural economic downturn, the strain on small rural communities, and a major population exodus in all States from towns with fewer than 4000 people have meant added health burdens for those communities, with possibly specific risk factors.1 The fact that the equivalent ratio for hanging rates changed little suggests that more general factors are also operating across all areas in relation to suicide in young men. Particular States have local issues which require specific attention, but the fact that all Australian States reflect the national trends in youth suicide in relation to sex and residential area supports a national approach to youth suicide prevention. Effective national approaches will depend in part on acquiring a better understanding of the similarities and differences in health risks faced by metropolitan and rural youth.1 |
Acknowledgements | Thanks are due to Caroline Haski and Margaret Alcock for their painstaking work as research assistants, and to the NSW Institute of Psychiatry, which partly funded this study. |
References |
(Received 12 May 1997, accepted 17 Apr 1998) |
Authors' details
University of New South Wales, Sydney, NSW.Michael J Dudley, MB BS, FRANZCP, Lecturer, School of Psychiatry.
Norman J Kelk, PhD, Social Worker, School of Community Medicine.
Prince of Wales Hospital, Sydney, NSW.
Tony M Florio, MPsych, Clinical Psychologist.
Macquarie University, Sydney, NSW.
John P Howard, PhD, Clinical Psychologist.
PO Box 474, Edgecliff, NSW.
Brent G H Waters, MD, FRANZCP, Psychiatrist.
Reprints will not be available from the authors.
Correspondence: Dr M
J Dudley, Department of Child and Adolescent Psychiatry, Sydney
Children's Hospital, Randwick, NSW 2031.
E-mail: m.dudleyATunsw.edu.au
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Received 27 December 2024, accepted 27 December 2024
- Michael J Dudley
- Norman J Kelk
- Tony M Florio
- John P Howard