Characterization of U-Shaped Exposure-Response Relationships with Application to a Copper Database
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The need to find an acceptable medium between excess and deficiency motivates the characterization of U-shaped exposure-response relationships. Previous work on a copper(Cu) database employed CatReg to model excess and deficiency conditions separately. Interest lies in simultaneously fitting these conditions. Using binary logistic regression, we have developed a methodology that can be used to simultaneously fit observations from excess and deficiency experiments. Capturing excess and deficiency conditions in one well-defined model facilitates the estimation of a U-shape function, with concentration on the horizontal axis and the probability of a non-normal reading on the vertical axis. The bottom of this U-shape function represents the dose of Cu associated with the smallest chance of adverse health effects attributed to an excess or deficient Cu condition, or both. For humans, this dose level is estimated to be 2.73 mg Cu/day with an acceptable range of oral intake between 1.57 and 4.46 mg Cu/day.
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Copyright © 2014 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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milton-characterizationofushapedexposureresponse.pdf | 2023-05-04 | Public | Download |