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. 2012 Feb 9;344:e536. doi: 10.1136/bmj.e536

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© Asbridge et al 2012

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/2.0/ and http://creativecommons.org/licenses/by-nc/2.0/legalcode.

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graphic file with name asbm000872.f4_default.jpg — Fig 4 Funnel plot examining possible publication bias in studies investigating the association between acute cannabis consumption and risk of motor vehicle crashes. The horizontal axis measures the association (odds ratio) observed in individual studies, plotted against the standard error. The broken vertical line indicates our overall pooled estimate from meta-analysis (odds ratio 1.92)