Relation of DDE and PBB serum levels in farm residents, consumers, and Michigan Chemical Corporation employees.

Environ Health Perspect · 1978 · PMC1637445 · PMID 209972

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a marked trendno p-value reported

Thus the distribution of serum PBB for chemical workers and quaran- tined groups showed a marked trend toward higher values.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.