An average decline in noise level of 1.1 dB(A) over 10 years may appear small, but remembering that 1 dB represents a power ratio of approximately 1.26 (the decibel is a logarithmic unit), the effect on hearing preservation may be significant.
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Noise-Induced Hearing Loss - A Preventable Disease? Results of a 10-Year Longitudinal Study of Workers Exposed to Occupational Noise.
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