title: A benchmark dose analysis of prenatal exposure to polychlorinated biphenyls.
abstract: Benchmark dose (BMD) analysis is used to determine levels of exposure to environmental contaminants associated with increased public health risk. In this study we used a benchmark approach to evaluate the risks associated with prenatal exposure to polychlorinated biphenyls (PCBs). We evaluated for intellectual impairment a cohort of children whose prenatal PCB exposure had been assessed from biologic specimens. We calculated BMDs and lower-bound confidence limits (BMDLs) for four end points using four sets of risk criteria. BMDLs were estimated using three different statistical methodologies. The BMDs and BMDLs were remarkably consistent across the four end points for each set of risk criteria, but differed substantially for the different risk criteria. The proportion of the sample considered at risk ranged from 9.8% for the least protective criteria to 74.1% for the most protective. Two methodologies, likelihood ratio and bootstrapping, generated generally similar BMDLs. BMD analysis provides a straightforward, reliable method for evaluating levels of exposure associated with increased public health risk. In the analyses performed in this study, the number of individuals considered at risk depended more on the risk criterion selected than on the outcome assessed.
authors.affiliation: Department of Psychology, Wayne State University, Detroit, Michigan 48202, USA. jjacobso@sun.science.wayne.edu
authors.forename: Joseph L
authors.initials: JL
authors.lastname: Jacobson
authors.forename: James
authors.initials: J
authors.lastname: Janisse
authors.forename: Mousumi
authors.initials: M
authors.lastname: Banerjee
authors.forename: Jennifer
authors.initials: J
authors.lastname: Jester
authors.forename: Sandra W
authors.initials: SW
authors.lastname: Jacobson
authors.forename: Joel W
authors.initials: JW
authors.lastname: Ager
mesh_terms: D000328:Adult; D019985:Benchmarking; D002648:Child; D003072:Cognition Disorders / Q000209:etiology*; D015331:Cohort Studies; D004305:Dose-Response Relationship, Drug; D004781:Environmental Exposure; D005260:Female; D006801:Humans; D007360:Intelligence; D008297:Male; D011078:Polychlorinated Biphenyls / Q000009:adverse effects* / Q000032:analysis; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects; D011634:Public Health; D018570:Risk Assessment
chemical_list: D011078:Polychlorinated Biphenyls