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Int. J. Environ. Res. Public Health 2015, 12(8), 9575-9588;

Can Public Health Risk Assessment Using Risk Matrices Be Misleading?

School of Public Health, University of Alberta, Edmonton, AB T6G 1C9, Canada
Faculty of Medicine & Dentistry, Division of Analytical and Environmental Toxicology, University of Alberta, Edmonton, AB T6G 2G3, Canada
Author to whom correspondence should be addressed.
Academic Editors: Igor Burstyn and Gheorghe Luta
Received: 11 June 2015 / Accepted: 11 August 2015 / Published: 14 August 2015
(This article belongs to the Special Issue Methodological Innovations and Reflections-1)
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The risk assessment matrix is a widely accepted, semi-quantitative tool for assessing risks, and setting priorities in risk management. Although the method can be useful to promote discussion to distinguish high risks from low risks, a published critique described a problem when the frequency and severity of risks are negatively correlated. A theoretical analysis showed that risk predictions could be misleading. We evaluated a practical public health example because it provided experiential risk data that allowed us to assess the practical implications of the published concern that risk matrices would make predictions that are worse than random. We explored this predicted problem by constructing a risk assessment matrix using a public health risk scenario—Tainted blood transfusion infection risk—That provides negative correlation between harm frequency and severity. We estimated the risk from the experiential data and compared these estimates with those provided by the risk assessment matrix. Although we validated the theoretical concern, for these authentic experiential data, the practical scope of the problem was limited. The risk matrix has been widely used in risk assessment. This method should not be abandoned wholesale, but users must address the source of the problem, apply the risk matrix with a full understanding of this problem and use matrix predictions to inform, but not drive decision-making. View Full-Text
Keywords: risk matrix; risk priorities; decision-making risk matrix; risk priorities; decision-making

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Vatanpour, S.; Hrudey, S.E.; Dinu, I. Can Public Health Risk Assessment Using Risk Matrices Be Misleading? Int. J. Environ. Res. Public Health 2015, 12, 9575-9588.

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