Abstract
The considerations and parameters underlying the assessment of risk of hearing loss for a population wearing personal hearing protective devices (HPD's) are examined. A damage risk function for a protected population is developed, and measures of hearing protector effectiveness are defined. It is noted that the Noise Reduction Rating (NRR) formulation of protector effectiveness cannot be validly used as a population‐oriented measure of hearing protector effectiveness. In the population‐oriented context, real‐ear attenuation values for hearing protectors obtained under user‐fit conditions must be used, but the mean value should only be reduced by 1/4 to 1/2 of a standard deviation in order to provide the required statistical confidence. Finally, some numerical examples of hearing protector effectiveness are developed using computer simulation akin to the Monte Carlo method.
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