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目的研究CO对钢铁企业噪声接触工人听力损失的影响。方法以江苏省某大型钢铁企业1 642人作为研究对象,分为对照组(A组)、单纯接触噪声组(B组)、同时接触噪声和CO(C组)、单纯接触CO组(D组),进行听力检查。使用logistic回归分析法研究CO浓度、噪声声级、年龄、工龄、性别等相关因素对噪声诱导的听力损失的影响。结果研究对象总体听力损失率为11.6%,随着年龄、工龄的增加,工人听力损失率升高,但在C组内各年龄、工龄段之间听力损失率差异无统计学意义(P>0.05);不同性别之间听力损失率在B组和C组出现相反的趋势;C组接触高浓度的CO工人,听力损失率比接触较低浓度CO的工人高,但两者之间差异无统计学意义(P>0.05);Logistic回归分析显示,研究影响听力损失的主要因素为年龄、噪声声级、工龄、性别。结论在正常生产情况下,接触CO的时间加权平均浓度(TWA)低于49.6mg/m3时,CO对噪声诱导的听力损失基本无影响。
Objective To study the effect of CO on the hearing loss of workers exposed to noise in iron and steel enterprises. Methods A total of 1,642 large-scale iron and steel enterprises in Jiangsu Province were divided into control group (group A), simple exposure to noise group (group B), simultaneous exposure to noise and CO (group C) ), For hearing tests. Logistic regression analysis was used to study the effects of CO concentration, noise level, age, length of service, gender and other related factors on noise-induced hearing loss. Results The overall hearing loss rate was 11.6%. With the increase of age and seniority, the hearing loss rate of workers increased. However, there was no significant difference in hearing loss rate among all age groups and working age groups in group C (P> 0.05 ). The rate of hearing loss among different genders appeared opposite trend in group B and C; in group C, workers exposed to high concentration of CO had higher hearing loss rate than workers exposed to lower concentration of CO, but there was no statistical difference between the two (P> 0.05). Logistic regression analysis showed that the main factors influencing hearing loss were age, noise level, length of service and gender. Conclusions Under normal production conditions, the time-weighted average exposure (TWA) to CO is less than 49.6 mg / m3, CO has no effect on noise-induced hearing loss.