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In our tests it produced roughly 70 percent as many shifts as the 10 dB rule, cannabis wool all over printed christmas ugly sweater but the difference was largely 10 dB shifts of questionable significance.

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To avoid this situation, an employer would have to establish 2 different baselines, one for the noise standard provisions, and one for the recordkeeping rule provisions. cannabis wool all over printed christmas ugly sweater This situation is unacceptable. We recommend that standard threshold shifts of 10 dB be used as the recordability criteria, since it is consistent with the 1910.95 noise standard. The arguments put forward by the Coalition to Preserve OSHA and NIOSH and Protect Workers’ Hearing (Exs. 26, 42) are, in OSHA’s view, compelling reasons for requiring employers to record on their Logs any case of work-related hearing loss that reaches the level of an STS. OSHA is particularly persuaded by the Coalition’s argument that “An age-corrected STS is a large hearing change that can affect

communicative competence” because an age-corrected STS represents a significant amount of cumulative hearing change from baseline hearing levels. In the words of the Coalition, “For an individual with normal hearing on the baseline audiogram, STS usually involves age-corrected shifts of dB at 3000 and 4000 Hz. For an individual with pre-existing high-frequency hearing loss on the baseline, STS usually involves substantial progression of the hearing loss into the critical speech frequencies. The absolute shift values before age corrections are considerably larger.” The Coalition also stressed that the method of averaging hearing loss at several frequencies, as is required to determine an STS under the OSHA Noise standard, tends to “obscure the large hearing shifts at individual frequencies which usually occur before the average changes by a specified amount” (Ex. 42, p. 10). b. A persistent 15 dB shift with age correction is a better yardstick for significant change due to noise.