Overall, studies relying on objective noise assessment (JEM/assessment by industrial hygienists) were somewhat discordant.[ 19 , 22 , 38 , 41 ] Three of those found elevated risk for IHD, but it was statistically significant only in the study by Virkkunen et al .[ 22 ] In the study by Selander et al .,[ 38 ] the OR for the comparison >75 dB versus <75 dB was marginally significant.
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