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- W2038004432 abstract "One approach to the toxicological evaluation of chemical mixtures is to construct full dose–response curves for each compound in the presence of a range of doses of each of the other compounds, i.e., a factorial design. This study was undertaken as part of an interdisciplinary project to evaluate a mixture of three environmental pollutants. A full-factorial design was undertaken to determine the neurobehavioral consequences of short-term repeated exposure to five dose levels each of three chemicals, in order to characterize potential two- and three-way interactions. Adult female F344 rats received (p.o.) for 10 days either one of five doses of trichloroethylene, di(2-ethylhexyl)phthalate, or heptachlor, or else one of all possible chemical combinations. Neurobehavioral evaluations were conducted using motor activity and an abbreviated functional observational battery. Response-surface analysis was applied to each of the endpoints. Hypotheses were tested based on the estimated model parameters; of primary interest was the overall test for interaction among the three chemicals. In addition, an abbreviated design was created by fitting only a subset of the data to the model. In general, significant overall interactions that deviated from response additivity were detected for most endpoints (11 of 14). All of the interactions on the neurobehavioral endpoints showed either antagonism, or else an interaction that could not be fully characterized. Often the results of the abbreviated dataset analysis were not the same as for the full-factorial design. This study was extremely intensive, in terms of the number of rats and time required for conduct of the study as well as the data analysis. These results underscore the need for more economical approaches to evaluate the toxic effects of mixtures of chemicals." @default.
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- W2038004432 date "2003-06-01" @default.
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- W2038004432 title "Neurobehavioral evaluations of mixtures of trichloroethylene, heptachlor, and di(2-ethylhexyl)phthlate in a full-factorial design" @default.
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- W2038004432 doi "https://doi.org/10.1016/s0300-483x(03)00083-0" @default.
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