Effects of gunfire on hearing level for selected individuals of the Inter-Industry Noise Study

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Abstract
Using the information available from inter-industry noise study, the hearing levels of 68 pairs of workers, matched for sex, age and exposure level, were evaluated. For each pair, 1 participant had indicated exposure to nonoccupational gunfire during the previous yr. Differences in mean hearing levels between the male participants exposed to gunfire and those not exposed were clearly apparent and varied between 9-16 dB for the frequencies at 3000, 4000 and 6000 Hz. There were no significant differences in female hearing threshold levels. These changes in male hearing were equivalent to the effect of an occupational exposure of 89 dB for 20 yr. The results did not indicate that there were any synergistic effects between gun exposures during a participant''s recreational time and noise exposure during his working hours.

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