2014年对一家工业公司中暴露于不同工业噪声水平的工人进行畸变产物耳声发射（DPOAE）评估。

Evaluation of Distortion Product Otoacoustic Emissions (DPOAEs) among workers at an Industrial Company exposed to different industrial noise levels in 2014.

作者信息

Zare Sajad, Nassiri Parvin, Monazzam Mohammad Reza, Pourbakht Akram, Azam Kamal, Golmohammadi Taghi

机构信息

Ph.D. Student, Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.

Professor, Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.

出版信息

Electron Physician. 2015 Jul 20;7(3):1126-34. doi: 10.14661/2015.1126-1134. eCollection 2015 Jul.

DOI:10.14661/2015.1126-1134

PMID:26388979

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4574699/

Abstract

BACKGROUND

Noise-induced hearing loss (NIHL) is usually one of the main problems in industrial settings. The aim of this study was to determine whether changes in the signal-to-noise ratio (SNR) in different DPOAE are caused by exposure to different levels of noise at different time intervals among workers exposed to noise.

METHODS

This case-control study was conducted in the autumn of 2014 on 45 workers at Gol Gohar Mining and Industrial Company, which is located in Sirjan in southeast Iran. The workers were divided into three groups based on their noise exposure, i.e., 1) 15 office workers as a control group with exposure to low levels of noise, 2) 15 workers from manufacturing departments who were exposed to a medium level of noise, and 3) 15 workers from manufacturing departments who were exposed to high levels of noise. The SNRs at the frequencies of 1000, 2000, 3000, 4000, and 6000 Hz were measured in both ears at three different time intervals during the shift work. SNRs of 6 or greater were considered as inclusion criterion. Repeated measures, the Spearman rank-order correlation test, and paired t-test analyses were used with α = 0.05 being the level of significance.

RESULTS

For all frequencies in the right and left ears, the SNR values were more than 6, thus all SNR values were considered as acceptable responses. The effects of time and sound pressure level (SPL) on SNR were significant for the right and left ears (p = 0.027 and < 0.001, respectively). There was a statistically significant correlation between the SNR values in the right and left ears for the time intervals 7:30-8:00 A.M. and 13:30-14:00 P.M., which implied that an increase in the duration of exposure led to reduced SNR values (p = 0.024, r = 0.948).

CONCLUSIONS

The comparison of the SNR values in the right and left ears (for all frequencies and the three different SPLs) indicated that the values decreased during the shift work.

摘要

背景

噪声性听力损失（NIHL）通常是工业环境中的主要问题之一。本研究的目的是确定在接触噪声的工人中，不同时间间隔暴露于不同水平噪声是否会导致不同畸变产物耳声发射（DPOAE）中的信噪比（SNR）发生变化。

方法

本病例对照研究于2014年秋季在位于伊朗东南部锡尔詹的戈尔戈哈尔矿业和工业公司的45名工人中进行。根据噪声暴露情况将工人分为三组，即1）15名办公室工作人员作为对照组，暴露于低水平噪声；2）15名来自制造部门的工人，暴露于中等水平噪声；3）15名来自制造部门的工人，暴露于高水平噪声。在轮班工作期间的三个不同时间间隔测量双耳在1000、2000、3000、4000和6000Hz频率处的SNR。SNR为6或更高被视为纳入标准。采用重复测量、Spearman等级相关检验和配对t检验分析，显著性水平α = 0.05。

结果

左右耳所有频率的SNR值均大于6，因此所有SNR值均被视为可接受的反应。时间和声压级（SPL）对左右耳SNR的影响均具有显著性（分别为p = 0.027和<0.001）。上午7:30 - 8:00和下午13:30 - 14:00时间间隔内，左右耳的SNR值之间存在统计学显著相关性，这表明暴露持续时间增加会导致SNR值降低（p = 0.024，r = 0.948）。