%0 Journal Article
%T Cannabis and traffic collision risk: findings from a case-crossover study of injured drivers presenting to emergency departments
%J International journal of public health
%D 2014
%A Asbridge, Mark
%A Mann, Robert
%A Cusimano, Michael D.
%A Trayling, Cynthia
%A Roerecke, Michael
%A Tallon, John M.
%A Whipp, Alyce
%A Rehm, Jürgen
%V 59
%N 2
%P 395-404
%X OBJECTIVES: This study examined whether acute cannabis use leads to an increased collision risk.   METHODS: Participants were 860 drivers presenting to emergency departments in Toronto and Halifax, Canada, with an injury from a traffic collision, between April 2009 and July 2011. Cannabis and other drug use were identified either through blood sample or self-report. A case-crossover design was employed with two control conditions: a fixed condition measuring substance use during last time driving, and whether the driver typically uses cannabis prior to driving. Collision risk was assessed through conditional fixed-effects logistic regression models.   RESULTS: Results revealed that 98 (11 %; 95 % CI: 9.0-13.1) drivers reported using cannabis prior to the collision. Regression results measuring exposure with blood and self-report data indicated that cannabis use alone was associated with a fourfold increased (OR 4.11; 95 % CI: 1.98-8.52) odds of a collision; a regression relying on self-report measures only found no significant association.   CONCLUSIONS: Main findings confirmed that cannabis use increases collision risk and reinforces existing policy and educational efforts, in many high-income countries, aimed at reducing driving under the influence of cannabis.   Keywords: Cannabis impaired driving <p /> <p>Language: en</p>
%G en
%I Holtzbrinck Springer Nature Publishing Group
%@ 1661-8556
%U http://dx.doi.org/10.1007/s00038-013-0512-z