Abstract
If the differences of hearing levels between males and females, as indicated in either the 1960–62 or 1971–75 Public Health Service Reports, are compared with the noise induced permanent threshold shifts (NIPTS) as predicted by ISO1999, these differences fit the NIPTS expected from an exposure of the males to 8 h levels from 89 to 93 dB. Since the number of male workers exposed to such noise is expected to be but a fraction of the total male population, nonoccupational noise exposure must be the most important contribution to this difference. Supporting figures and analysis will be presented to make this point. The role of dosimetry and noise exposure questionnaires in defining nonoccupational noise will also be discussed.
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