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Within the context of IHD, the SMR, calculated with a 95% confidence interval, was 112 (088-141) for noise levels under 85 dBA, 118 (090-155) for noise levels between 85 and 90 dBA, and 127 (110-147) for noise levels exceeding 90 dBA among workers. Subjects exposed to both intense noise and substantial paper dust experienced an incrementally higher death rate from IHD (SMR 139, 95% CI 115-167). Noise exposure levels and the SMR (standardized mortality
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