Age-related sensorineural hearing loss that progresses gradually with aging, predominantly affecting high frequencies. Presbycusis can confound occupational STS determinations in older workers. OSHA allows (but does not require) age correction using Appendix F tables when calculating STS. Age correction is not permitted in Oregon or Washington for OSHA compliance purposes. Age correction cannot be applied when evaluating whether the 25 dB recordable threshold is met.
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