Bartsch R, Dieroff H G, Brueckner C
Institute of Industrial Medicine, Friedrich-Schiller-University Jena, GDR.
Int Arch Occup Environ Health. 1989;61(5):347-51. doi: 10.1007/BF00409391.
We investigated a total of 537 subjects (68 men, 469 women) working in the textile industry to ascertain their hearing level in the conventional hearing range as well as in the high-frequency (HF) range. The persons we tested work at three different noise-levels [80-84, 85-89, 90-94 dB (A), measured as leq). The differences in the hearing thresholds between this three groups mentioned were checked by means of discriminant analysis. The first hearing level changes at a noise-level below 90 dB (A) leq develop mainly in the HF range. In the conventional hearing range, however, the hearing levels remain unchanged even over long exposure times. Noise-induced hearing loss in the conventional range occurs only in the sound level group of 90 to 94 dB (A) leq without attaining any social importance. The tests show that, if the noise-level 90 dB (A) leq is not exceeded, no noise-induced hearing impairments involving social hearing loss are to be observed. Thus we assume that an auditory risk criterion of 85 dB (A) leq is sufficient to prevent hearing loss of any social importance.
我们共调查了537名从事纺织行业的受试者（68名男性，469名女性），以确定他们在常规听力范围以及高频（HF）范围内的听力水平。我们测试的人员在三种不同的噪声水平下工作[80 - 84、85 - 89、90 - 94 dB（A），以等效连续A声级（leq）测量]。通过判别分析检查上述三组之间听力阈值的差异。在等效连续A声级低于90 dB（A）的噪声水平下，最初的听力水平变化主要发生在高频范围内。然而，在常规听力范围内，即使长时间暴露，听力水平仍保持不变。常规范围内的噪声性听力损失仅发生在等效连续A声级为90至94 dB（A）的声级组中，且未达到任何社会层面的重要程度。测试表明，如果不超过等效连续A声级90 dB（A），则不会观察到涉及社会听力损失的噪声性听力损伤。因此，我们认为等效连续A声级85 dB（A）的听觉风险标准足以预防任何具有社会重要性的听力损失。
