Document Detail

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.
MedLine Citation:
PMID:  19425669     Owner:  NLM     Status:  MEDLINE    
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 (naive) 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).
William J Murphy; David C Byrne; Dan Gauger; William A Ahroon; Elliott Berger; Samir N Y Gerges; Richard McKinley; Brad Witt; Edward F Krieg
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  125     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-05-11     Completed Date:  2009-08-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3262-77     Citation Subset:  IM    
Hearing Loss Prevention Team, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, MS C-27, Cincinnati, Ohio 45226-1998, USA.
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MeSH Terms
Analysis of Variance
Auditory Threshold
Ear Canal / anatomy & histology
Ear Protective Devices*
Guidelines as Topic*
Head / anatomy & histology
National Institute for Occupational Safety and Health (U.S.)*
Prosthesis Fitting / methods
Reproducibility of Results
United States
United States Environmental Protection Agency* / legislation & jurisprudence

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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