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To investigate the effects of combined exposure to benzene mixture and noise on occupational noise-induced hearing loss in male workers.
This study focused on 1 283 male workers from a bus manufacturing company. A total of 889 workers exposed occupational noise were in the noise exposure group, and 394 workers exposed to both benzene mixture and noise were in the combined exposure group. Pure-tone air conduction threshold tests were conducted on both groups at six frequencies: 500 Hz, 1 000 Hz, 2 000 Hz, 3 000 Hz, 4 000 Hz, and 6 000 Hz. Then the differences in high-frequency and speech-frequency hearing loss between the two groups were compared and the impact of age, work experience, body mass index(BMI), smoking, alcohol consumption, hypertension, and exposure factors on hearing loss was analyzed.
The high-frequency and speech-frequency hearing loss in the combined exposure group were significantly higher than the noise group(P<0.01). As age increased, the detection rate of hearing loss also increased among the workers(P<0.01). Combined exposure to benzene and noise, age ≥40 years, work experience ≥20 years, and alcohol consumption were the risk factors for high-frequency hearing loss(P<0.01). Combined exposure to benzene and noise, age ≥40 years, and work experience of 10-20 years were the risk factors for speech-frequency hearing loss(P<0.01). Combined exposure to benzene and noise increased the risk of noise-induced hearing loss(NIHL) among the workers(OR for high-frequency=1.974, OR for speech-frequency=13.086).
Combined exposure to benzene and noise may have a synergistic effect on NIHL.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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