Characterising violent deaths of undetermined intent: A population-based study, 1999-2012

James Lachaud, Peter Donnelly, David Henry, Kathy Kornas, Tiffany Fitzpatrick, Andrew Calzavara, Catherine Bornbaum, Laura Rosella

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)
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Abstract

OBJECTIVES: Violent deaths classified as undetermined intent (UD) are sometimes included in suicide counts. This study investigated age and sex differences, along with socioeconomic gradients in UD and suicide deaths in the province of Ontario between 1999 and 2012.

METHODS: We used data from the Institute for Clinical Evaluative Sciences, which has linked vital statistics from the Office of the Registrar General Deaths register with Census data between 1999 and 2012. Socioeconomic status was operationalised through the four dimensions of the Ontario Marginalization Index. We computed age-specific and annual age-standardised mortality rates, and risk ratios to calculate risk gradients according to each of the four dimensions of marginalization.

RESULTS: Rates of UD-classified deaths were highest for men aged 45-64 years residing in the most materially deprived (7.9 per 100 000 population (95% CI 6.8 to 9.0)) and residentially unstable (8.1 (95% CI 7.1 to 9.1)) neighbourhoods. Similarly, suicide rates were highest among these same groups of men aged 45-64 living in the most materially deprived (28.2 (95% CI 26.1 to 30.3)) and residentially unstable (30.7 (95% CI 28.7 to 32.6)) neighbourhoods. Relative to methods of death, poisoning was the most frequently used method in UD cases (64%), while it represented the second most common method (27%) among suicides after hanging (40%).

DISCUSSION: The similarities observed between both causes of death suggest that at least a proportion of UD deaths may be misclassified suicide cases. However, the discrepancies identified in this analysis seem to indicate that not all UD deaths are misclassified suicides.

Original languageEnglish
Pages (from-to)418-424
Number of pages7
JournalInjury Prevention
Volume24
Issue number6
Early online date6 Oct 2017
DOIs
Publication statusPublished - 1 Jan 2018
Externally publishedYes

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Suicide
Population
Ontario
Vital Statistics
Censuses
Social Class
Sex Characteristics
Poisoning
Cause of Death
Odds Ratio
Mortality

Cite this

Lachaud, J., Donnelly, P., Henry, D., Kornas, K., Fitzpatrick, T., Calzavara, A., ... Rosella, L. (2018). Characterising violent deaths of undetermined intent: A population-based study, 1999-2012. Injury Prevention, 24(6), 418-424. https://doi.org/10.1136/injuryprev-2017-042376
Lachaud, James ; Donnelly, Peter ; Henry, David ; Kornas, Kathy ; Fitzpatrick, Tiffany ; Calzavara, Andrew ; Bornbaum, Catherine ; Rosella, Laura. / Characterising violent deaths of undetermined intent : A population-based study, 1999-2012. In: Injury Prevention. 2018 ; Vol. 24, No. 6. pp. 418-424.
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abstract = "OBJECTIVES: Violent deaths classified as undetermined intent (UD) are sometimes included in suicide counts. This study investigated age and sex differences, along with socioeconomic gradients in UD and suicide deaths in the province of Ontario between 1999 and 2012.METHODS: We used data from the Institute for Clinical Evaluative Sciences, which has linked vital statistics from the Office of the Registrar General Deaths register with Census data between 1999 and 2012. Socioeconomic status was operationalised through the four dimensions of the Ontario Marginalization Index. We computed age-specific and annual age-standardised mortality rates, and risk ratios to calculate risk gradients according to each of the four dimensions of marginalization.RESULTS: Rates of UD-classified deaths were highest for men aged 45-64 years residing in the most materially deprived (7.9 per 100 000 population (95{\%} CI 6.8 to 9.0)) and residentially unstable (8.1 (95{\%} CI 7.1 to 9.1)) neighbourhoods. Similarly, suicide rates were highest among these same groups of men aged 45-64 living in the most materially deprived (28.2 (95{\%} CI 26.1 to 30.3)) and residentially unstable (30.7 (95{\%} CI 28.7 to 32.6)) neighbourhoods. Relative to methods of death, poisoning was the most frequently used method in UD cases (64{\%}), while it represented the second most common method (27{\%}) among suicides after hanging (40{\%}).DISCUSSION: The similarities observed between both causes of death suggest that at least a proportion of UD deaths may be misclassified suicide cases. However, the discrepancies identified in this analysis seem to indicate that not all UD deaths are misclassified suicides.",
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Lachaud, J, Donnelly, P, Henry, D, Kornas, K, Fitzpatrick, T, Calzavara, A, Bornbaum, C & Rosella, L 2018, 'Characterising violent deaths of undetermined intent: A population-based study, 1999-2012' Injury Prevention, vol. 24, no. 6, pp. 418-424. https://doi.org/10.1136/injuryprev-2017-042376

Characterising violent deaths of undetermined intent : A population-based study, 1999-2012. / Lachaud, James; Donnelly, Peter; Henry, David; Kornas, Kathy; Fitzpatrick, Tiffany; Calzavara, Andrew; Bornbaum, Catherine; Rosella, Laura.

In: Injury Prevention, Vol. 24, No. 6, 01.01.2018, p. 418-424.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Lachaud, James

AU - Donnelly, Peter

AU - Henry, David

AU - Kornas, Kathy

AU - Fitzpatrick, Tiffany

AU - Calzavara, Andrew

AU - Bornbaum, Catherine

AU - Rosella, Laura

N1 - © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

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Y1 - 2018/1/1

N2 - OBJECTIVES: Violent deaths classified as undetermined intent (UD) are sometimes included in suicide counts. This study investigated age and sex differences, along with socioeconomic gradients in UD and suicide deaths in the province of Ontario between 1999 and 2012.METHODS: We used data from the Institute for Clinical Evaluative Sciences, which has linked vital statistics from the Office of the Registrar General Deaths register with Census data between 1999 and 2012. Socioeconomic status was operationalised through the four dimensions of the Ontario Marginalization Index. We computed age-specific and annual age-standardised mortality rates, and risk ratios to calculate risk gradients according to each of the four dimensions of marginalization.RESULTS: Rates of UD-classified deaths were highest for men aged 45-64 years residing in the most materially deprived (7.9 per 100 000 population (95% CI 6.8 to 9.0)) and residentially unstable (8.1 (95% CI 7.1 to 9.1)) neighbourhoods. Similarly, suicide rates were highest among these same groups of men aged 45-64 living in the most materially deprived (28.2 (95% CI 26.1 to 30.3)) and residentially unstable (30.7 (95% CI 28.7 to 32.6)) neighbourhoods. Relative to methods of death, poisoning was the most frequently used method in UD cases (64%), while it represented the second most common method (27%) among suicides after hanging (40%).DISCUSSION: The similarities observed between both causes of death suggest that at least a proportion of UD deaths may be misclassified suicide cases. However, the discrepancies identified in this analysis seem to indicate that not all UD deaths are misclassified suicides.

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