© 1994 Oxford University Press
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Clustering of Attempted Suicide: New Zealand National Data
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* Department of Psychiatry Columbia University New York, NY, USA
** School of Public Health, Columbia University New York, NY, USA
New York State Psychiatric Institute NY, USA
Department of Psychiatry and Behavioural Science, Auckland University Medical School New Zealand
§ Department of Biomathematical Sciences, Mt Sinai Medical School
Reprint requests to: Dr Gould, Division of Child Psychiatry, Columbia University, College of Physicians and Surgeons, 722 West 168th Street, New York, NY 10032, USA
BACKGROUND: The extent to which clusters of attempted suicides occur is a significant problem that is complementary to the current available research on the clustering of completed suicide. However, little systematic research on clusters of attempted suicides exists. The present study examines the extent and nature of clustering of suicide attempts.
METHOD: The occurrence of clustering of attempted suicide was examined in nationwide data for all New Zealand hospitals, obtained from the New Zealand Health Statistics Services for the years 19881990. The Scan statistic and Knox procedure were employed for testing the significance of clusters in time and time-space, respectively.
RESULTS: The analyses indicated that significant time clustering occurred in younger age groups, specifically among 1519 and 2024 year olds. The results could not be accounted for by seasonal variations in admissions. Age specificity of time-space clusters emerged, exhibiting a similar pattern to that reported for completed suicides in the US.
CONCLUSIONS: The results suggest a similar underlying mechanism for the clustering of parasuicide and completed suicides and provide support for the existence of contagion of suicidal behaviour. The implications for prevention are discussed.
Received 1 March 1994
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