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Use of historical data and a novel metric in the evaluation of the effectiveness of hearing conservation program components.

Authors
Heyer-N; Morata-TC; Pinkerton-LE; Brueck-SE; Stancescu-D; Prince Panaccio-M; Kim-H; Sinclair-JS; Waters-MA; Estill-CF; Franks-JR
Source
Occup Environ Med 2011 Jul; 68(7):510-517
NIOSHTIC No.
20037958
Abstract
Objectives: To evaluate the effectiveness of hearing conservation programs (HCP) and their specific components in reducing noise-induced hearing loss (NIHL). Methods: This retrospective cohort study was conducted at one food-processing plant and two automotive plants. Audiometric and work-history databases were combined with historical noise monitoring data to develop a time-dependent exposure matrix for each plant. Historical changes in production and HCP implementation were collected from company records, employee interviews and focus groups. These data were used to develop time-dependent quality assessments for various HCP components. 5478 male (30,427 observations) and 1005 female (5816 observations) subjects were included in the analysis. Results: Analyses were conducted separately for males and females. Females tended to have less NIHL at given exposure levels than males. Duration of noise exposure stratified by intensity (dBA) was a better predictor of NIHL than the standard equivalent continuous noise level (Leq) based upon a 3-dBA exchange. Within this cohort, efficient dBA strata for males were <95 versus >/=95, and for females <90 versus >/=90. The reported enforced use of hearing protection devices (HPDs) significantly reduced NIHL. The data did not have sufficient within-plant variation to determine the effectiveness of noise monitoring or worker training. An association between increased audiometric testing and NIHL was believed to be an artifact of increased participation in screening. Conclusions: Historical audiometric data combined with noise monitoring data can be used to better understand the effectiveness of HCPs. Regular collection and maintenance of quality data should be encouraged and used to monitor the effectiveness of these interventions.
Keywords
Hearing-conservation; Noise-induced-hearing-loss; Food-processing-workers; Automotive-industry; Audiometry; Exposure-assessment; Noise-exposure; Noise-measurement; Men; Women; Hearing-protection; Ear-protectors; Workplace-monitoring; Medical-screening
Contact
Nicholas Heyer, Battelle CPHRE, 1100 Dexter Ave N, Suite 400, Seattle, WA 98109-3598, USA
CODEN
OEMEEM
Publication Date
20110701
Document Type
Journal Article
Email Address
heyern@battelle.org
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Issue of Publication
7
ISSN
1351-0711
NIOSH Division
DART; DSHEFS
Priority Area
Manufacturing
Source Name
Occupational and Environmental Medicine
State
WA; OH; CA
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