The role of under-employment and unemployment in recent birth cohort effects in Australian suicide.

High suicide rates evident in Australian young adults during an epidemic period in the 1990s appear to have been sustained in older age-groups in the subsequent decade. This period also coincides with changes in employment patterns in Australia. This study investigates age, period, and birth cohort effects in Australian suicide over the 20th century, with particular reference to the period subsequent to the 1990s youth suicide epidemic in young males. Period- and cohort-specific trends in suicide were examined for 1907-2010 based on descriptive analysis of age-specific suicide rates and a series of age-period-cohort (APC) models using Poisson regression. Under-employment rates (those employed part-time seeking additional hours of work) and unemployment rates (those currently seeking employment) for the latter part of this time series (1978-2010) were also examined and compared with period- and cohort-specific trends in suicide. A significant increasing birth cohort effect in male suicide rates was evident in birth cohorts born after 1970-74, after adjusting for the effects age and period. An increasing birth cohort effect was also evident in female suicide rates, but was of a lesser magnitude. Increases in male cohort-specific suicide rates were significantly correlated with increases in cohort-specific under-employment and unemployment rates. Birth cohorts that experienced the peak of the suicide epidemic during the 1990s have continued to have higher suicide rates than cohorts born in earlier epochs. This increase coincides with changes to a labour force characterised by greater 'flexibility' and 'casualised' employment, especially in younger aged cohorts.

[1]  E. Etzersdorfer,et al.  Sex differential for suicide among Austrian age cohorts , 1996, Acta psychiatrica Scandinavica.

[2]  F. Rodríguez‐Artalejo,et al.  Age-period-cohort analysis of suicide mortality rates in Spain, 1959-1991. , 1996, International journal of epidemiology.

[3]  R. Kalediene.  Time trends in suicide mortality J in Lithuania , 1999, Acta psychiatrica Scandinavica.

[4]  G. Werneck,et al.  Age-period-cohort analysis of suicide rates in Rio de Janeiro, Brazil, 1979–1998 , 2005, Social Psychiatry and Psychiatric Epidemiology.

[5]  S. Newman,et al.  On the age-period-cohort analysis of suicide rates , 1988, Psychological Medicine.

[6]  J. Harrison,et al.  Suicide decline in Australia: where did the cases go? , 2009, Australian and New Zealand journal of public health.

[7]  P. Martikainen,et al.  A register-based study on excess suicide mortality among unemployed men and women during different levels of unemployment in Finland , 2010, Journal of Epidemiology & Community Health.

[8]  D Clayton,et al.  Models for temporal variation in cancer rates. II: Age-period-cohort models. , 1987, Statistics in medicine.

[9]  Richard J. K. Taylor,et al.  The Australian epidemic of cardiovascular mortality 1935–2005: effects of period and birth cohort , 2011, Journal of Epidemiology & Community Health.

[10]  Richard J. K. Taylor,et al.  Recent Declines in Australian Male Suicide are Real, not Artefactual , 2010, The Australian and New Zealand journal of psychiatry.

[11]  Bernice A. Pescosolido,et al.  The Sociology of Suicide , 2011 .

[12]  I. Hickie,et al.  Making new choices about antidepressants in Australia: the long view 1975–2002 , 2004, The Medical journal of Australia.

[13]  Keith Hawton,et al.  Suicide clusters: a review of risk factors and mechanisms. , 2013, Suicide & life-threatening behavior.

[14]  G. Moens,et al.  Birth cohort analysis of suicide mortality in Belgium 1954–1981 by a graphic and a quantitative method , 1987, Acta psychiatrica Scandinavica.

[15]  G. Davey Smith,et al.  A New Approach to Age-Period-Cohort Analysis Using Partial Least Squares Regression: The Trend in Blood Pressure in the Glasgow Alumni Cohort , 2011, PloS one.

[16]  S. Fienberg,et al.  Identification and estimation of age-period-cohort models in the analysis of discrete archival data , 1979 .

[17]  L L Kupper,et al.  Statistical age-period-cohort analysis: a review and critique. , 1985, Journal of chronic diseases.

[18]  U. Åsgård,et al.  Birth cohort analysis of changing suicide risk by sex and age in Sweden 1952 to 1981 , 1987, Acta psychiatrica Scandinavica.

[19]  J. Short,et al.  Suicide and Homicide: Some Economic, Sociological and Psychological Aspects of Aggression. , 1955 .

[20]  A. Bauman,et al.  Asthma mortality in Australia 1920-94: age, period, and cohort effects. , 1997, Journal of epidemiology and community health.

[21]  N. Stenhouse,et al.  The Relationship between Suicide, Undetermined Deaths and Accidental Deaths in the Australian Born and Migrants in Australia , 1982, The Australian and New Zealand journal of psychiatry.

[22]  J. Harrison,et al.  Achieving standardised reporting of suicide in Australia: rationale and program for change , 2010, The Medical journal of Australia.

[23]  Donald Storrie,et al.  Does Job Loss Shorten Life? , 2009, The Journal of Human Resources.

[24]  Richard J. K. Taylor,et al.  Effectiveness of Australian youth suicide prevention initiatives , 2011, British Journal of Psychiatry.

[25]  J. Duffy,et al.  Suicide in England and Wales 1946–1985: an age‐period‐cohort analysis , 1989, Acta psychiatrica Scandinavica.

[26]  D. Dooley,et al.  Underemployment and depression: longitudinal relationships. , 2000, Journal of health and social behavior.

[27]  D. Gunnell,et al.  Influence of cohort effects on patterns of suicide in England and Wales, 1950–1999 , 2003, British Journal of Psychiatry.

[28]  C. Vecchia,et al.  Age, period of death and birth cohort effects on suicide mortality in Italy, 1955–1979 , 1986, Acta psychiatrica Scandinavica.

[29]  R. Wilkinson,et al.  Socioeconomic determinants of health: Health inequalities: relative or absolute material standards? , 1997 .

[30]  Ilo Employment Trends.  Global Employment Trends for Youth, 2006 , 2006 .

[31]  C. Cantor,et al.  Australian Suicide Data and the use of “Undetermined” Death Category (1968–1985) , 1990, The Australian and New Zealand journal of psychiatry.

[32]  R. G. Oliver,et al.  RISE AND FALL OF SUICIDE RATES IN AUSTRALIA: RELATION TO SEDATIVE AVAILABILITY , 1972 .

[33]  R. Kosky,et al.  Suicide rates in adolescent youths , 1988, The Medical journal of Australia.

[34]  J. Grzywacz,et al.  "Good jobs" to "bad jobs": replicated evidence of an employment continuum from two large surveys. , 2003, Social science & medicine.

[35]  F. Gutzwiller,et al.  Age–period–cohort analysis of Swiss suicide data, 1881–2000 , 2006, European Archives of Psychiatry and Clinical Neuroscience.

[36]  R. Price,et al.  Underemployment: Consequences for the Health and Well-Being of Workers , 2003, American journal of community psychology.

[37]  P. Saunders.  Examining Recent Changes in Income Distribution in Australia , 2004 .

[38]  Andrew Page,et al.  Duration of unemployment and suicide in Australia over the period 1985–2006: an ecological investigation by sex and age during rising versus declining national unemployment rates , 2012, Journal of Epidemiology & Community Health.

[39]  Y. Odagiri,et al.  Gender Differences in Age, Period, and Birth-Cohort Effects on the Suicide Mortality Rate in Japan, 1985-2006 , 2011, Asia-Pacific journal of public health.

[40]  F. McKee-Ryan,et al.  “I Have a Job, But . . .”: A Review of Underemployment , 2011 .

[41]  Richard J. K. Taylor,et al.  The decline in Australian young male suicide. , 2007, Social science & medicine.

[42]  S. Morrell,et al.  Birth cohort effects in New South Wales suicide, 1865–1998 , 2002, Acta psychiatrica Scandinavica.

[43]  J. Boyages,et al.  Estimating risk of breast cancer from population incidence affected by widespread mammographic screening , 2001, Journal of medical screening.

[44]  J. Snowdon,et al.  Age, period and cohort effects on suicide rates in Australia, 1919–1999 , 2002, Acta psychiatrica Scandinavica.

[45]  B. Cox,et al.  Suicide in New Zealand 1957–1986: The Influence of Age, Period and Birth-Cohort , 1991, The Australian and New Zealand journal of psychiatry.

[46]  M. Solomon,et al.  Suicide and age in Alberta, Canada, 1951 to 1977. A cohort analysis. , 1980, Archives of general psychiatry.