In contrast, among workers with more than 15 years of employment, there were significant exposure–response trends for total dust and cristobalite, and a borderline significant trend for quartz.
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Mortality from non-malignant respiratory diseases among workers in the Norwegian silicon carbide industry: associations with dust exposure.
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The sentences
Internal analyses in models of ever-smokers using OLD as underlying cause of death showed significantly increased risks at the two higher levels of exposure to SiC (incidence rate ratio (IRR) 3.1 and 3.4, respectively), with a significant trend (p trend =0.03).