Part 380. Occupational Noise Exposure - Audiometric Testing
An STS is calculated by comparing the annual audiogram to the baseline audiogram at 2,000, 3,000 and 4,000 Hz. If an average difference of 10 dB or more has occurred at these frequencies, an STS has occurred. Example 1: Frequency Hz. Annual Audiogram. Baseline Audiogram. Annual - Baseline. 2,000 5 dB. 10 db. 5 – 10 dB = -5 dB. 3,000 20 dB. 15 db ................
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