Ivanovich E, Kolarova D, Enev S, Savov A, Koĭcheva V
Probl Khig. 1995;20:100-9.
At main workplaces in F. "Stomana" (Pernik City) sorting and sheetrolling works, measurements and evaluation of the noise factor were carried out, and hearing sensitivity of workers was investigated in 229 subjects of mean age 36.1 +/- 9.8 years and mean occupational experience 9.7 +/- 7.4 years. Findings at workplaces indicated presence of noise of excessive equivalent levels and pulsing nature varying in degrees. Hearing thresholds for 4 and 6 kHz and average speaking frequency were elevated, and the proportion of subjects with hearing threshold above 30 dB for all frequencies tested was larger among the job groups of roller workers, furnace men, cutters, crane workers, markers, packers, quality control surveyors, and dispatchers as compared to subjects working at lower noise levels or exposed for shorter times to intense noise, notably, operators, fitters, welders, electrotechnicians. Regression analysis revealed the dynamics of change in hearing sensitivity to be more closely related to age than to duration of occupational experience.
在位于佩尔尼克市的“斯托马纳”工厂的主要工作场所，开展了分拣和卷板作业中的噪声因素测量与评估，并对229名平均年龄为36.1±9.8岁、平均职业经历为9.7±7.4年的工人进行了听力敏感度调查。工作场所的调查结果表明存在等效水平过高且脉冲性质各异的噪声。4kHz和6kHz以及平均说话频率的听力阈值升高，与在较低噪声水平下工作或暴露于高强度噪声时间较短的工人（特别是操作员、钳工、焊工、电工）相比，轧辊工人、司炉工、切割工、起重机工人、标记工、包装工、质量控制测量员和调度员等工种中所有测试频率听力阈值高于30dB的受试者比例更高。回归分析显示，听力敏感度变化的动态与年龄的相关性比与职业经历时长的相关性更强。
