RT Journal Article SR Electronic T1 Characterising violent deaths of undetermined intent: a population-based study, 1999–2012 JF Injury Prevention JO Inj Prev FD BMJ Publishing Group Ltd SP injuryprev-2017-042376 DO 10.1136/injuryprev-2017-042376 A1 James Lachaud A1 Peter Donnelly A1 David Henry A1 Kathy Kornas A1 Tiffany Fitzpatrick A1 Andrew Calzavara A1 Catherine Bornbaum A1 Laura Rosella YR 2017 UL http://injuryprevention.bmj.com/content/early/2017/10/06/injuryprev-2017-042376.abstract AB 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.