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Graber JM, Stayner LT, Conroy LM, et al. Respiratory-related mortality among U.S. coalminers; results after 37-years of follow-up. Occup Environ Med 2014;71:30–9. This article included some errors, they are listed below:

▸ In Abstract, in the sentence which begins “Mortality from COPD was significantly elevated among ever smokers and former smokers…”, the word ‘ever’ should be ‘never’. The sentence correctly reads: “Mortality from COPD was significantly elevated among never smokers and former smokers…”. And the upper limits of the confidence intervals for the hazard ratio for average cohort exposure to respirable silica associated with mortality from pneumoconiosis and COPD were incorrectly reported as 1.33 and 1.52 respectively. The correct confidence limits are shown on table 3 and are HR=1.33, 95% CI 0.94 to 1.90 for mortality from pneumoconiosis and HR=1.04, 95% CI 0.96 to 1.14 for mortality from COPD.

▸ In Results, Lung Cancer, in the first sentence of the second paragraph "model" is misspelled as "morel".

▸ In table 4, the confidence interval from the dual exposure model for the hazard ratio (0.99) for the cumulative exposure to respirable silica should be 0.84 to 1.18. Also the number of lung cancer deaths in the title should be 568. Please find the corrected part of table 4 below.

Table 4

HRs for mortality due to lung cancer mortality (568 deaths) estimated in Cox proportional hazards models controlling for age at study entry, race and year of birth, and other covariates as listed

▸ In Discussion, the last sentence of the first full paragraph should read: “In our study the effect of silica exposure was weakened when we controlled for coal mine dust (HR=1.04; 95% CI 0.96 to 1.14)”.

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