Standard Article

Added Risk

Environmental Health

  1. R. Webster West

Published Online: 15 SEP 2006

DOI: 10.1002/9780470057339.vaa009

Encyclopedia of Environmetrics

Encyclopedia of Environmetrics

How to Cite

West, R. W. 2006. Added Risk. Encyclopedia of Environmetrics. 1.

Author Information

  1. University of South Carolina, SC, USA

Publication History

  1. Published Online: 15 SEP 2006


Dose–response studies of environmental toxins are designed to determine the detrimental effects associated with exposure to the toxin, over a particular range of exposures. To properly quantify the toxic effect of a toxin, the background risk of no exposure to the toxin, R(0), must first be specified. The additional risk incurred by exposure to a dose, d, of the toxin is then called the added risk (AR) at this dose and is given by AR(d) = R(d) – R(0).