A study conducted by the National Institutes of Health claims that high levels of polychlorinated biphenyls in the human body are making it harder for couples to conceive. However, such "preliminary" findings fail to establish a definitive link between high exposure and delayed conception, according to American Chemistry Council spokeswoman Kathryn Murray St. John. "The authors themselves note that the study has significant limitations, including lack of data on specific exposures to some chemicals. Given the large number of statistical analyses involved in this report, it is not surprising that some associations were found," St. John said.
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