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A multicenter study on the audiometric findings of styrene-exposed workers.

Authors
Morata-TC; Sliwinska-Kowalska-M; Johnson-AC; Starck-J; Pawlas-K; Zamyslowska-Szmytke-E; Nylen-P; Toppila-E; Krieg-EF; Pawlas-N; Prasher-D
Source
Int J Audiol 2011 Oct; 50(10):652-660
NIOSHTIC No.
20039287
Abstract
Objective: The objective of this study was to evaluate hearing loss among workers exposed to styrene, alone or with noise. Design: This cross-sectional study was conducted as part of NoiseChem, a European Commission 5th Framework Programme research project, by occupational health institutes in Finland, Sweden, and Poland. Study sample: Participants' ages ranged from 18-72 years (n = 1620 workers). Participants exposed to styrene, alone or with noise, were from reinforced fiberglass products manufacturing plants (n = 862). Comparison groups were comprised of workers noise-exposed (n = 400) or controls (n = 358). Current styrene exposures ranged from 0 to 309 mg/m3, while mean current noise levels ranged from 70-84 dB(A). Hearing thresholds of styrene-exposed participants were compared with Annexes A and B from ANSI S3.44, 1996. Results: The audiometric thresholds of styrene exposed workers were significantly poorer than those in published standards. Age, gender, and styrene exposure met the significance level criterion in the multiple logistic regression for the binary outcome 'hearing loss' (P = 0.0000). Exposure to noise (less than 85 dBA p = 0.0001; greater than/equal to 85 dB(A) p = 0.0192) interacted significantly with styrene exposure. Conclusions: Occupational exposure to styrene is a risk factor for hearing loss, and styrene-exposed workers should be included in hearing loss prevention programs.
Keywords
Hearing; Hearing-loss; Hearing-threshold; Styrenes; Exposure-assessment; Exposure-levels; Noise-exposure; Noise-induced-hearing-loss; Noise-levels; Noise-measurement; Ototoxicity; Risk-factors; Audiological-testing; Auditory-system; Demographic-characteristics; Statistical-analysis; Standards; Hearing-conservation; Author Keywords: Pure-tone audiometry; Otologically unscreened; Noise; Hearing loss
Contact
Thais C. Morata, Division of Applied Research and Technology, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, C27, Cincinnati, OH 45226, USA
CODEN
IJANGS
CAS No.
100-42-5
Publication Date
20111001
Document Type
Journal Article
Email Address
morata@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Issue of Publication
10
ISSN
1499-2027
NIOSH Division
DART
Priority Area
Construction; Manufacturing
Source Name
International Journal of Audiology
State
OH
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