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Hearing conservation program for agricultural students: short-term outcomes from a cluster-randomized trial with planned long-term follow-up.

Authors
Berg-RL; Pickett-W; Fitz-Randolph-M; Broste-SK; Knobloch-MJ; Wood-DJ; Kirkhorn-SR; Linneman-JG; Marlenga-B
Source
Prev Med 2009 Dec; 49(6):546-552
NIOSHTIC No.
20036547
Abstract
OBJECTIVES: (1) To conduct a contemporary analysis of historical data on short-term efficacy of a 3-year hearing conservation program conducted from 1992 to 1996 in Wisconsin, USA, with 753 high school students actively involved in farm work; (2) to establish procedures for assessment of hearing loss for use in a recently funded follow-up of this same hearing conservation program cohort. METHODS: We analyzed a pragmatic cluster-randomized controlled trial, with schools as the unit of randomization. Thirty-four rural schools were recruited and randomized to intervention or control. The intervention included classroom instruction, distribution of hearing protection devices, direct mailings, noise level assessments, and yearly audiometric testing. The control group received the audiometric testing. RESULTS: Students exposed to the hearing conservation program reported more frequent use of hearing protection devices, but there was no evidence of reduced levels of noise-induced hearing loss (NIHL). CONCLUSION: Our analysis suggests that, since NIHL is cumulative, a 3-year study was likely not long enough to evaluate the efficacy of this intervention. While improvements in reported use of hearing protection devices were noted, the lasting impact of these behaviors is unknown and the finding merits corroboration by longer term objective hearing tests. A follow-up study of the cohort has recently been started.
Keywords
Agricultural-industry; Agricultural-workers; Agriculture; Audiological-testing; Audiometry; Education; Exposure-assessment; Exposure-levels; Exposure-methods; Hearing; Hearing-conservation; Hearing-level; Hearing-protection; Hearing-tests; Noise; Noise-exposure; Noise-levels; Noise-sources; Work-areas; Work-environment; Work-operations; Work-practices; Author Keywords: Agriculture; Hearing conservation; Noise-induced hearing loss; Youth
Contact
Barbara Marlenga, National Farm Medicine Center, Marshfield Clinic Research Foundation, 1000 North Oak Avenue, Marshfield, WI 54449
CODEN
PVTMA3
Publication Date
20091201
Document Type
Journal Article
Email Address
marlenga.barbara@mcrf.mfldclin.edu
Funding Type
Grant; Cooperative Agreement
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-009392; Cooperative-Agreement-Number-U07-CCU-507126; Cooperative-Agreement-Number-U54-OH-009568
Issue of Publication
6
ISSN
0091-7435
Source Name
Preventive Medicine
State
WI; MN
Performing Organization
Marshfield Clinic Research Foundation
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