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BioMed Research International
Volume 2015, Article ID 201494, 5 pages
http://dx.doi.org/10.1155/2015/201494
Research Article

Audiogram Comparison of Workers from Five Professional Categories

Occupational-Otolaryngological Medical Service, Department of Otolaryngology, Head and Neck Surgery, Rua Vital Brasil 251, School of Medical Sciences (FCM), University of Campinas (Unicamp), 13083-888 Campinas, SP, Brazil

Received 12 August 2014; Accepted 14 November 2014

Academic Editor: Ralph Mösges

Copyright © 2015 Alexandre Scalli Mathias Duarte et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Introduction. Noise is a major cause of health disorders in workers and has unique importance in the auditory analysis of people exposed to it. The purpose of this study is to evaluate the arithmetic mean of the auditory thresholds at frequencies of 3, 4, and 6 kHz of workers from five professional categories exposed to occupational noise. Methods. We propose a retrospective cross-sectional cohort study to analyze 2.140 audiograms from seven companies having five sectors of activity: one footwear company, one beverage company, two ceramics companies, two metallurgical companies, and two transport companies. Results. When we compared two categories, we noticed a significant difference only for cargo carriers in comparison to the remaining categories. In all activity sectors, the left ear presented the worst values, except for the footwear professionals . We observed an association between the noise exposure time and the reduction of audiometric values for both ears. Significant differences existed for cargo carriers in relation to other groups. This evidence may be attributed to different forms of exposure. A slow and progressive deterioration appeared as the exposure time increased.