论文部分内容阅读
目的评价电焊烟尘与噪声联合作用致作业工人听力损伤的情况。方法分别对电焊烟尘与噪声联合暴露组、单纯噪声暴露组和对照组作业工人气导听力进行测试。结果联合组听力损伤总检出率为61.54%,其中高频、语频、Ⅰ级、Ⅱ级、Ⅲ级及以上听力损伤率分别为60.00%,35.38%,16.92%,23.08%和20.00%。联合组听力异常率明显高于单纯噪声组和对照组(P<0.05),高频、语频、Ⅱ级、Ⅲ级及Ⅲ级以上听力损伤率均较噪声组、对照组明显升高(P<0.05)。各组不同频率的听阈均值比较,联合组的0.5,1,2,3,4和6kHz听阈值分别为(22.98±6.28),(21.38±7.88),(22.04±10.19),(26.55±16.69),(31.52±18.86)和(33.75±19.71)dB(A),均高于噪声组、对照组(P<0.05)。结论电焊烟尘与噪声联合暴露可加重作业工人听力损伤。
Objective To evaluate the combined effects of welding fume and noise on workers’ hearing impairment. Methods The air conduction hearing test of workers exposed to welding fume and noise, simple noise exposure group and control group were tested respectively. Results The total hearing loss rate in the combined group was 61.54%. The hearing loss rates of high frequency, speech frequency, grade Ⅰ, Ⅱ, Ⅲ and above were 60.00%, 35.38%, 16.92%, 23.08% and 20.00% respectively. The hearing loss rate in the combined group was significantly higher than that in the noise group and the control group (P <0.05). The hearing loss rate in high frequency, speech frequency, grade Ⅱ, grade Ⅲ and grade Ⅲ were significantly higher than those in the noise group and control group (P <0.05). The listening thresholds of 0.5, 1, 2, 3, 4 and 6 kHz in the combined group were (22.98 ± 6.28), (21.38 ± 7.88), (22.04 ± 10.19) and (26.55 ± 16.69) , (31.52 ± 18.86) and (33.75 ± 19.71) dB (A), respectively, which were higher than those in noise group and control group (P <0.05). Conclusion The joint exposure of welding fume and noise can aggravate hearing impairment of workers.