The risk of pulmonary tuberculosis in underground copper miners in Zambia exposed to respirable silica: a cross-sectional study.

BMC Public Health · 2016 · PMC4995829 · PMID 27552992

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a significant trendno p-value reported

8–23)) and a significant trend of increasing disease prevalence with increasing cumulative respirable silica dust categories was observed (p trend < 0.01).

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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.