Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Results of the National Institute for Occupational Safety and Health - U.S. Environmental Protection Agency interlaboratory comparison of American National Standards Institute S12.6-1997 methods A and B.

Authors
Murphy-WJ; Byrne-DC; Gauger-D; Ahroon-WA; Berger-E; Gerges-SNY; McKinley-R; Witt-B; Krieg-EF
Source
J Acoust Soc Am 2009 May; 125(5):3262-3277
NIOSHTIC No.
20035378
Abstract
The National Institute for Occupational Safety and Health and the Environmental Protection Agency sponsored the completion of an interlaboratory study to compare two fitting protocols specified by ANSI S12.6-1997 (R2002) [(2002). American National Standard Methods for the Measuring Real-Ear Attenuation of Hearing Protectors, American National Standards Institute, New York]. Six hearing protection devices (two earmuffs, foam, premolded, custom-molded earplugs, and canal-caps) were tested in six laboratories using the experimenter-supervised, Method A, and (na´ve) subject-fit, Method B, protocols with 24 subjects per laboratory. Within-subject, between-subject, and between-laboratory standard deviations were determined for individual frequencies and A-weighted attenuations. The differences for the within-subject standard deviations were not statistically significant between Methods A and B. Using between-subject standard deviations from Method A, 3-12 subjects would be required to identify 6-dB differences between attenuation distributions. Whereas using between-subject standard deviations from Method B, 5-19 subjects would be required to identify 6-dB differences in attenuation distributions of a product tested within the same laboratory. However, the between-laboratory standard deviations for Method B were -0.1 to 3.0 dB less than the Method A results. These differences resulted in considerably more subjects being required to identify statistically significant differences between laboratories for Method A (12-132 subjects) than for Method B (9-28 subjects).
Keywords
Hearing-conservation; Hearing-impairment; Hearing-disorders; Hearing-loss; Hearing-protection; Personal-protective-equipment; Personal-protection; Standards; Noise-induced-hearing-loss; Noise-protection; Author Keywords: ANSI standards; ear protection; hearing; noise (working environment); noise pollution; occupational health; occupational safety; safety devices;
Contact
William J. Murphy, Hearing Loss Prevention Team, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, MS C-27, Cincinnati, Ohio 45226-1998
CODEN
JASMAN
Publication Date
20090501
Document Type
Journal Article
Email Address
wmurphy@cdc.gov
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
0001-4966
NIOSH Division
DART
Source Name
Journal of the Acoustical Society of America
State
OH; MA; AL; IN; CA
TOP