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Using regression techniques, I re-analyzed the dataset cited by the US Environmental Protection Agency in its Exposure Factors Handbook that contains measurements of skin area, height, and body weight for 401 people spanning all stages of development. This re-analysis shows that a univariate model for total skin area as a function of body weight gives useful practical results with little or no loss of reliability as compared to the Agency's bivariate model. This new result leads to a new method to develop LogNormal distributions for total skin area as a function of body weight alone. Because these new methods replicate previously published results with much less effort, I recommend their use in probabilistic exposure assessments and risk assessments.
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