A morbidity study of former pentachlorophenol-production workers.

Environ Health Perspect · 1998 · PMC1533134 · PMID 9637797

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a significant trendno p-value reported

We found a significant trend in the odds of developing chloracne during the first year of exposure using time intervals of 3-29, 30-89, 90-179, 180-364, and ?365 days.

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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.