| ARTICLE |
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| Year : 2011 | Volume
: 13
| Issue : 51 | Page : 132--141 |
Effects of training on hearing protector attenuation
William J Murphy1, Mark R Stephenson1, David C Byrne1, Brad Witt2, Jesse Duran2
1 National Institute for Occupational Safety and Health, Division of Applied Research and Technology, Engineering and Physical Hazards Branch, Hearing Loss Prevention Team, Cincinnati, OH 45226-1998, USA
2 Howard Leight Acoustical Test Laboratory, Sperian Hearing Protection, LLC 7828 Waterville Road, San Diego, CA 92154, USA
Correspondence Address:
William J Murphy
Captain, U.S. Public Health Service, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, MS C-27, Cincinnati OH 45226-1998
USA
 Source of Support: Partially supported by The Environmental Protection Agency through interagency agreement DW75921973-01-0, Conflict of Interest: None  | Check |
DOI: 10.4103/1463-1741.77215
The effect of training instruction, whether presented as the manufacturer's printed instructions, a short video training session specific to the product, or as a one-on-one training session was evaluated using four hearing protection devices with eight groups of subjects. Naïve subjects were recruited and tested using three different forms of training: written, video, and individual training. The group averages for A-weighted attenuation were not statistically significant when compared between the video or the written instruction conditions, regardless of presentation order. The experimenter-trained A-weighted attenuations were significantly greater than the written and video instruction for most of the protectors and groups. For each earplug, the noise reduction statistic for A-weighting (NRS A ) and the associated confidence intervals were calculated for the 80 th and 20 th percentiles of protection. Across subject groups for each protector, the differences between NRS A ratings were found to be not statistically significant. Several comparisons evaluating the order of testing, the type of testing, and statistical tests of the performance across the groups are presented.
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