Audiology and Neurotology
Original Paper
The Annex C Fallacy: Why Unscreened Databases Are Usually Preferable for Comparison of Industrially Exposed GroupsDobie R.A.a · Agrawal Y.baUniversity of Texas Health Science Center at San Antonio, San Antonio, Tex., and University of California, Davis, Calif., bJohns Hopkins University, Baltimore, Md., USA
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Article / Publication Details
Received: November 24, 2009
Accepted: March 17, 2010
Published online: May 29, 2010
Issue release date: December 2010
Number of Print Pages: 7
Number of Figures: 1
Number of Tables: 4
ISSN: 1420-3030 (Print)
eISSN: 1421-9700 (Online)
For additional information: https://www.karger.com/AUD
Abstract
One can study occupational noise exposure by comparing hearing thresholds of exposed people to control data from national or international standards. ANSI S3.44 (1996) offers Annex C – thresholds for people without occupational noise exposure – as appropriate control data for such comparisons. Annex C is based on the false assumption that people who have had occupational noise exposure are similar in all other important ways to those without such exposures. In fact, people with noisy jobs are more likely than others to be smokers, diabetics, poorly educated, white and exposed to non-occupational noise. Taking these other risk factors into account, the appropriate thresholds for comparison to industrial study populations are closer to those of the unscreened population than to an ‘Annex C’ population that simply excludes occupationally noise-exposed persons.
© 2010 S. Karger AG, Basel
References
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American National Standards Institute: Determination of occupational noise exposure and estimation of noise-induced hearing impairment. ANSI S3.44 – 1996. New York, Acoustical Society of America, 1996.
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Hoffman HJ, Dobie RA, Ko CW, Themann CL, Murphy WJ: Americans hear as well or better today compared to 40 years ago: hearing threshold levels in the unscreened adult population of the US, 1959–62 and 1999–2004. Ear Hearing, in press.
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External Resources
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National Center for Health Statistics: National Health and Nutrition Examination Survey: HES I and NHANES 1999–2004 data files: data, docs, codebooks, SAS code. www.cdc.gov/nchs/nhanes.htm (accessed September 24, 2009).
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National Institute for Occupational Safety and Health: Criteria for a recommended standard. Occupational noise exposure: revised criteria. Cincinnati, NIOSH, 1998, pp 9–59.
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- Royster LH, Driscoll DP, Thomas WG, Royster JD: Age effect hearing levels for a black nonindustrial noise exposed population (NINEP). Am Ind Hyg Assoc J 1980;41:113–119.
- Tambs K, Hoffman HJ, Borchgrevik HM, Holmen J, Samuelsen SO: Hearing loss induced by noise, ear infections, and head injuries: results from the Nord-Trondelag hearing loss study. Intl J Audiol 2003;42:89–105.
Article / Publication Details
Received: November 24, 2009
Accepted: March 17, 2010
Published online: May 29, 2010
Issue release date: December 2010
Number of Print Pages: 7
Number of Figures: 1
Number of Tables: 4
ISSN: 1420-3030 (Print)
eISSN: 1421-9700 (Online)
For additional information: https://www.karger.com/AUD
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